diff --git a/src/libslic3r/PrintConfig.hpp b/src/libslic3r/PrintConfig.hpp
index 75079ee716..b97168e84e 100644
--- a/src/libslic3r/PrintConfig.hpp
+++ b/src/libslic3r/PrintConfig.hpp
@@ -762,6 +762,8 @@ PRINT_CONFIG_CLASS_DERIVED_DEFINE(
     ((ConfigOptionInt,                standby_temperature_delta))
     ((ConfigOptionInts,               temperature))
     ((ConfigOptionInt,                threads))
+    ((ConfigOptionPoints,             thumbnails))
+    ((ConfigOptionEnum<GCodeThumbnailsFormat>,  thumbnails_format))
     ((ConfigOptionBools,              wipe))
     ((ConfigOptionBool,               wipe_tower))
     ((ConfigOptionFloat,              wipe_tower_x))
diff --git a/src/slic3r/GUI/UnsavedChangesDialog.cpp b/src/slic3r/GUI/UnsavedChangesDialog.cpp
index d49b4b1d34..c62977bbaf 100644
--- a/src/slic3r/GUI/UnsavedChangesDialog.cpp
+++ b/src/slic3r/GUI/UnsavedChangesDialog.cpp
@@ -1030,7 +1030,7 @@ bool UnsavedChangesDialog::save(PresetCollection* dependent_presets, bool show_s
 wxString get_string_from_enum(const std::string& opt_key, const DynamicPrintConfig& config, bool is_infill = false)
 {
     const ConfigOptionDef& def = config.def()->options.at(opt_key);
-    const std::vector<std::string>& names = def.enum_labels;//ConfigOptionEnum<T>::get_enum_names();
+    const std::vector<std::string>& names = def.enum_labels.empty() ? def.enum_values : def.enum_labels;
     int val = config.option(opt_key)->getInt();
 
     // Each infill doesn't use all list of infill declared in PrintConfig.hpp.