diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 4fc63aa790..e7b404e5e6 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -1123,7 +1123,7 @@ void PrintConfigDef::init_fff_params()
     def->enum_keys_map = &ConfigOptionEnum<InfillPattern>::get_enum_values();
     def->enum_values = def_top_fill_pattern->enum_values;
     def->enum_labels = def_top_fill_pattern->enum_labels;
-    def->set_default_value(new ConfigOptionEnum<InfillPattern>(ipRectilinear));
+    def->set_default_value(new ConfigOptionEnum<InfillPattern>(ipMonotonic));
 
 	def                = this->add("internal_solid_infill_pattern", coEnum);
     def->label         = L("Internal solid infill pattern");
@@ -1132,7 +1132,7 @@ void PrintConfigDef::init_fff_params()
     def->enum_keys_map = &ConfigOptionEnum<InfillPattern>::get_enum_values();
     def->enum_values   = def_top_fill_pattern->enum_values;
     def->enum_labels   = def_top_fill_pattern->enum_labels;
-    def->set_default_value(new ConfigOptionEnum<InfillPattern>(ipRectilinear));
+    def->set_default_value(new ConfigOptionEnum<InfillPattern>(ipMonotonic));
     
     def = this->add("outer_wall_line_width", coFloatOrPercent);
     def->label = L("Outer wall");