diff --git a/src/libslic3r/Config.cpp b/src/libslic3r/Config.cpp
index 2675d1996..9e93783e9 100644
--- a/src/libslic3r/Config.cpp
+++ b/src/libslic3r/Config.cpp
@@ -474,8 +474,8 @@ t_config_option_keys ConfigBase::diff(const ConfigBase &other) const
         const ConfigOption *this_opt  = this->option(opt_key);
         const ConfigOption *other_opt = other.option(opt_key);
         //dirty if both exist, they aren't both phony and value is different
-        if (this_opt != nullptr && other_opt != nullptr && !(this_opt->phony && other_opt->phony) 
-            && ((*this_opt != *other_opt) || (this_opt->phony != other_opt->phony)))
+        if (this_opt != nullptr && other_opt != nullptr && !(this_opt->is_phony() && other_opt->is_phony())
+            && ((*this_opt != *other_opt) || (this_opt->is_phony() != other_opt->is_phony())))
             diff.emplace_back(opt_key);
     }
     return diff;
@@ -497,7 +497,7 @@ std::string ConfigBase::opt_serialize(const t_config_option_key &opt_key) const
 {
     const ConfigOption* opt = this->option(opt_key);
     assert(opt != nullptr);
-    if (opt->phony)
+    if (opt->is_phony())
         return "";
     return opt->serialize();
 }
@@ -595,11 +595,11 @@ bool ConfigBase::set_deserialize_raw(const t_config_option_key &opt_key_src, con
     //set phony status
     if (optdef->can_phony)
         if(value.empty())
-            opt->phony = true;
+            opt->set_phony(true);
         else
-            opt->phony = false;
+            opt->set_phony(false);
     else
-        opt->phony = false;
+        opt->set_phony(false);
 
     return ok;
 }
diff --git a/src/libslic3r/Config.hpp b/src/libslic3r/Config.hpp
index 8dada869b..470ea3eb0 100644
--- a/src/libslic3r/Config.hpp
+++ b/src/libslic3r/Config.hpp
@@ -215,10 +215,12 @@ inline OutputFormat operator&=(OutputFormat& a, OutputFormat b) {
 class ConfigOption {
 public:
     // if true, this option doesn't need to be saved, it's a computed value from an other configOption.
-    bool phony;
+    // uint32_t because macos crash if it's a bool. and it doesn't change the size of the object because of alignment.
+    uint32_t phony;
+
 
     ConfigOption() : phony(false) {}
-    ConfigOption(bool phony) : phony(phony) {}
+    ConfigOption(bool phony) : phony(uint32_t(phony)) {}
 
     virtual ~ConfigOption() {}
 
@@ -240,6 +242,8 @@ public:
     virtual bool 				nullable()		const { return false; }
     // A scalar is nil, or all values of a vector are nil.
     virtual bool 				is_nil() 		const { return false; }
+    bool                        is_phony()      const { return phony != 0; }
+    void                        set_phony(bool phony) { this->phony = phony ? 1 : 0; }
     // Is this option overridden by another option?
     // An option overrides another option if it is not nil and not equal.
     virtual bool 				overriden_by(const ConfigOption *rhs) const {
diff --git a/src/libslic3r/Preset.cpp b/src/libslic3r/Preset.cpp
index b3c3b3156..6b62f3186 100644
--- a/src/libslic3r/Preset.cpp
+++ b/src/libslic3r/Preset.cpp
@@ -1394,8 +1394,8 @@ inline t_config_option_keys deep_diff(const ConfigBase &config_this, const Confi
         const ConfigOption *this_opt  = config_this.option(opt_key);
         const ConfigOption *other_opt = config_other.option(opt_key);
         //dirty if both exist, they aren't both phony and value is different
-        if (this_opt != nullptr && other_opt != nullptr && !(this_opt->phony && other_opt->phony)
-            && ((*this_opt != *other_opt) || (this_opt->phony != other_opt->phony)))
+        if (this_opt != nullptr && other_opt != nullptr && !(this_opt->is_phony() && other_opt->is_phony())
+            && ((*this_opt != *other_opt) || (this_opt->is_phony() != other_opt->is_phony())))
         {
             if (opt_key == "bed_shape" || opt_key == "thumbnails" || opt_key == "compatible_prints" || opt_key == "compatible_printers") {
                 // Scalar variable, or a vector variable, which is independent from number of extruders,
diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 206122361..b9462967a 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -5518,7 +5518,7 @@ void PrintConfigDef::to_prusa(t_config_option_key& opt_key, std::string& value,
         if (std::set<std::string>{"extrusion_width", "first_layer_extrusion_width", "perimeter_extrusion_width", "external_perimeter_extrusion_width", 
             "infill_extrusion_width", "solid_infill_extrusion_width", "top_infill_extrusion_width"}.count(opt_key) > 0) {
             const ConfigOptionFloatOrPercent* opt = all_conf.option<ConfigOptionFloatOrPercent>(opt_key);
-            if (opt->phony) {
+            if (opt->is_phony()) {
                 //bypass the phony kill switch from Config::opt_serialize
                 value = opt->serialize();
             }
@@ -5790,7 +5790,7 @@ bool DynamicPrintConfig::update_phony(const std::vector<const DynamicPrintConfig
         ConfigOptionFloatOrPercent* width_option = this->option<ConfigOptionFloatOrPercent>(key_width);
         ConfigOptionFloatOrPercent* spacing_option = this->option<ConfigOptionFloatOrPercent>(key_spacing);
         if (width_option && spacing_option)
-            if (!spacing_option->phony && width_option->phony)
+            if (!spacing_option->is_phony() && width_option->is_phony())
                 something_changed |= value_changed(key_spacing, config_collection);
             else
                 something_changed |= value_changed(key_width, config_collection);
@@ -5820,8 +5820,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
             if (opt_key == "extrusion_spacing") {
                 ConfigOptionFloatOrPercent* width_option = this->option<ConfigOptionFloatOrPercent>("extrusion_width");
                 if (width_option) {
-                    width_option->phony = true;
-                    spacing_option->phony = false;
+                    width_option->set_phony(true);
+                    spacing_option->set_phony(false);
                     width_option->value = (spacing_option->percent) ? std::round(100 * flow.width / max_nozzle_diameter) : (std::round(flow.width * 10000) / 10000);
                     width_option->percent = spacing_option->percent;
                     something_changed = true;
@@ -5830,8 +5830,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
             if (opt_key == "first_layer_extrusion_spacing") {
                 ConfigOptionFloatOrPercent* width_option = this->option<ConfigOptionFloatOrPercent>("first_layer_extrusion_width");
                 if (width_option) {
-                    width_option->phony = true;
-                    spacing_option->phony = false;
+                    width_option->set_phony(true);
+                    spacing_option->set_phony(false);
                     width_option->value = (spacing_option->percent) ? std::round(100 * flow.width / max_nozzle_diameter) : (std::round(flow.width * 10000) / 10000);
                     width_option->percent = spacing_option->percent;
                     something_changed = true;
@@ -5841,8 +5841,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
                 const ConfigOptionPercent* perimeter_overlap_option = find_option<ConfigOptionPercent>("perimeter_overlap", this, config_collection);
                 ConfigOptionFloatOrPercent* width_option = this->option<ConfigOptionFloatOrPercent>("perimeter_extrusion_width");
                 if (width_option && perimeter_overlap_option) {
-                    width_option->phony = true;
-                    spacing_option->phony = false;
+                    width_option->set_phony(true);
+                    spacing_option->set_phony(false);
                     flow.spacing_ratio = perimeter_overlap_option->get_abs_value(1);
                     flow.width = spacing_option->get_abs_value(max_nozzle_diameter) + layer_height_option->value * (1. - 0.25 * PI) * flow.spacing_ratio;
                     width_option->value = (spacing_option->percent) ? std::round(100 * flow.width / max_nozzle_diameter) : (std::round(flow.width * 10000) / 10000);
@@ -5854,8 +5854,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
                 const ConfigOptionPercent* external_perimeter_overlap_option = find_option<ConfigOptionPercent>("external_perimeter_overlap", this, config_collection);
                 ConfigOptionFloatOrPercent* width_option = this->option<ConfigOptionFloatOrPercent>("external_perimeter_extrusion_width");
                 if (width_option && external_perimeter_overlap_option) {
-                    width_option->phony = true;
-                    spacing_option->phony = false;
+                    width_option->set_phony(true);
+                    spacing_option->set_phony(false);
                     flow.spacing_ratio = external_perimeter_overlap_option->get_abs_value(0.5);
                     flow.width = spacing_option->get_abs_value(max_nozzle_diameter) + layer_height_option->value * (1. - 0.25 * PI) * flow.spacing_ratio;
                     width_option->value = (spacing_option->percent) ? std::round(100 * flow.width / max_nozzle_diameter) : (std::round(flow.width * 10000) / 10000);
@@ -5866,8 +5866,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
             if (opt_key == "infill_extrusion_spacing") {
                 ConfigOptionFloatOrPercent* width_option = this->option<ConfigOptionFloatOrPercent>("infill_extrusion_width");
                 if (width_option) {
-                    width_option->phony = true;
-                    spacing_option->phony = false;
+                    width_option->set_phony(true);
+                    spacing_option->set_phony(false);
                     width_option->value = (spacing_option->percent) ? std::round(100 * flow.width / max_nozzle_diameter) : (std::round(flow.width * 10000) / 10000);
                     width_option->percent = spacing_option->percent;
                     something_changed = true;
@@ -5876,8 +5876,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
             if (opt_key == "solid_infill_extrusion_spacing") {
                 ConfigOptionFloatOrPercent* width_option = this->option<ConfigOptionFloatOrPercent>("solid_infill_extrusion_width");
                 if (width_option) {
-                    width_option->phony = true;
-                    spacing_option->phony = false;
+                    width_option->set_phony(true);
+                    spacing_option->set_phony(false);
                     width_option->value = (spacing_option->percent) ? std::round(100 * flow.width / max_nozzle_diameter) : (std::round(flow.width * 10000) / 10000);
                     width_option->percent = spacing_option->percent;
                     something_changed = true;
@@ -5886,8 +5886,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
             if (opt_key == "top_infill_extrusion_spacing") {
                 ConfigOptionFloatOrPercent* width_option = this->option<ConfigOptionFloatOrPercent>("top_infill_extrusion_width");
                 if (width_option) {
-                    width_option->phony = true;
-                    spacing_option->phony = false;
+                    width_option->set_phony(true);
+                    spacing_option->set_phony(false);
                     width_option->value = (spacing_option->percent) ? std::round(100 * flow.width / max_nozzle_diameter) : (std::round(flow.width * 10000) / 10000);
                     width_option->percent = spacing_option->percent;
                     something_changed = true;
@@ -5921,8 +5921,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
             if (opt_key == "extrusion_width") {
                 ConfigOptionFloatOrPercent* spacing_option = this->option<ConfigOptionFloatOrPercent>("extrusion_spacing");
                 if (width_option) {
-                    width_option->phony = false;
-                    spacing_option->phony = true;
+                    width_option->set_phony(false);
+                    spacing_option->set_phony(true);
                     Flow flow = Flow::new_from_config_width(FlowRole::frPerimeter, *width_option, max_nozzle_diameter, layer_height_option->value, 0);
                     spacing_option->value = (width_option->percent) ? std::round(100 * flow.spacing() / max_nozzle_diameter) : (std::round(flow.spacing() * 10000) / 10000);
                     spacing_option->percent = width_option->percent;
@@ -5932,8 +5932,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
             if (opt_key == "first_layer_extrusion_width") {
                 ConfigOptionFloatOrPercent* spacing_option = this->option<ConfigOptionFloatOrPercent>("first_layer_extrusion_spacing");
                 if (width_option) {
-                    width_option->phony = false;
-                    spacing_option->phony = true;
+                    width_option->set_phony(false);
+                    spacing_option->set_phony(true);
                     Flow flow = Flow::new_from_config_width(FlowRole::frPerimeter, *width_option, max_nozzle_diameter, layer_height_option->value, 0);
                     spacing_option->value = (width_option->percent) ? std::round(100 * flow.spacing() / max_nozzle_diameter) : (std::round(flow.spacing() * 10000) / 10000);
                     spacing_option->percent = width_option->percent;
@@ -5944,8 +5944,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
                 const ConfigOptionPercent* perimeter_overlap_option = find_option<ConfigOptionPercent>("perimeter_overlap", this, config_collection);
                 ConfigOptionFloatOrPercent* spacing_option = this->option<ConfigOptionFloatOrPercent>("perimeter_extrusion_spacing");
                 if (width_option && perimeter_overlap_option) {
-                    width_option->phony = false;
-                    spacing_option->phony = true;
+                    width_option->set_phony(false);
+                    spacing_option->set_phony(true);
                     Flow flow = Flow::new_from_config_width(FlowRole::frExternalPerimeter, *width_option, max_nozzle_diameter, layer_height_option->value, 0);
                     flow.spacing_ratio = perimeter_overlap_option->get_abs_value(1);
                     spacing_option->value = (width_option->percent) ? std::round(100 * flow.spacing() / max_nozzle_diameter) : (std::round(flow.spacing() * 10000) / 10000);
@@ -5957,8 +5957,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
                 const ConfigOptionPercent* external_perimeter_overlap_option = find_option<ConfigOptionPercent>("external_perimeter_overlap", this, config_collection);
                 ConfigOptionFloatOrPercent* spacing_option = this->option<ConfigOptionFloatOrPercent>("external_perimeter_extrusion_spacing");
                 if (width_option && external_perimeter_overlap_option) {
-                    width_option->phony = false;
-                    spacing_option->phony = true;
+                    width_option->set_phony(false);
+                    spacing_option->set_phony(true);
                     Flow ext_perimeter_flow = Flow::new_from_config_width(FlowRole::frPerimeter, *width_option, max_nozzle_diameter, layer_height_option->value, 0);
                     ext_perimeter_flow.spacing_ratio = external_perimeter_overlap_option->get_abs_value(0.5);
                     spacing_option->value = (width_option->percent) ? std::round(100 * ext_perimeter_flow.spacing() / max_nozzle_diameter) : (std::round(ext_perimeter_flow.spacing() * 10000) / 10000);
@@ -5969,8 +5969,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
             if (opt_key == "infill_extrusion_width") {
                 ConfigOptionFloatOrPercent* spacing_option = this->option<ConfigOptionFloatOrPercent>("infill_extrusion_spacing");
                 if (width_option) {
-                    width_option->phony = false;
-                    spacing_option->phony = true;
+                    width_option->set_phony(false);
+                    spacing_option->set_phony(true);
                     Flow flow = Flow::new_from_config_width(FlowRole::frInfill, *width_option, max_nozzle_diameter, layer_height_option->value, 0);
                     spacing_option->value = (width_option->percent) ? std::round(100 * flow.spacing() / max_nozzle_diameter) : (std::round(flow.spacing() * 10000) / 10000);
                     spacing_option->percent = width_option->percent;
@@ -5980,8 +5980,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
             if (opt_key == "solid_infill_extrusion_width") {
                 ConfigOptionFloatOrPercent* spacing_option = this->option<ConfigOptionFloatOrPercent>("solid_infill_extrusion_spacing");
                 if (width_option) {
-                    width_option->phony = false;
-                    spacing_option->phony = true;
+                    width_option->set_phony(false);
+                    spacing_option->set_phony(true);
                     Flow flow = Flow::new_from_config_width(FlowRole::frSolidInfill, *width_option, max_nozzle_diameter, layer_height_option->value, 0);
                     spacing_option->value = (width_option->percent) ? std::round(100 * flow.spacing() / max_nozzle_diameter) : (std::round(flow.spacing() * 10000) / 10000);
                     spacing_option->percent = width_option->percent;
@@ -5991,8 +5991,8 @@ bool DynamicPrintConfig::value_changed(const t_config_option_key& opt_key, const
             if (opt_key == "top_infill_extrusion_width") {
                 ConfigOptionFloatOrPercent* spacing_option = this->option<ConfigOptionFloatOrPercent>("top_infill_extrusion_spacing");
                 if (width_option) {
-                    width_option->phony = false;
-                    spacing_option->phony = true;
+                    width_option->set_phony(false);
+                    spacing_option->set_phony(true);
                     Flow flow = Flow::new_from_config_width(FlowRole::frTopSolidInfill, *width_option, max_nozzle_diameter, layer_height_option->value, 0);
                     spacing_option->value = (width_option->percent) ? std::round(100 * flow.spacing() / max_nozzle_diameter) : (std::round(flow.spacing() * 10000) / 10000);
                     spacing_option->percent = width_option->percent;
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index 2af86563e..3228fce74 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -661,12 +661,12 @@ void Tab::update_changed_ui()
     const Preset& selected_preset = m_presets->get_selected_preset();
     const Preset* system_preset   = m_presets->get_selected_preset_parent();
     for (auto& opt_key : m_presets->get_edited_preset().config.keys()) {
-        if (edited_preset.config.option(opt_key)->phony)
+        if (edited_preset.config.option(opt_key)->is_phony())
             //ensure that osCurrentPhony is in the bitmask 
             m_options_list[opt_key] |= osCurrentPhony;
-        if (selected_preset.config.option(opt_key)->phony)
+        if (selected_preset.config.option(opt_key)->is_phony())
             m_options_list[opt_key] |= osInitPhony;
-        if (system_preset && system_preset->config.option(opt_key)->phony)
+        if (system_preset && system_preset->config.option(opt_key)->is_phony())
             m_options_list[opt_key] |= osSystemPhony;
     }