diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 3831b08cb..f61d2ed9c 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -483,7 +483,7 @@ void PrintConfigDef::init_fff_params()
     def->enum_values = def_top_fill_pattern->enum_values;
     def->enum_labels = def_top_fill_pattern->enum_labels;
     def->aliases = def_top_fill_pattern->aliases;
-    def->set_default_value(new ConfigOptionEnum<InfillPattern>(ipRectilinear));
+    def->set_default_value(new ConfigOptionEnum<InfillPattern>(ipMonotonic));
 
     def = this->add("external_perimeter_extrusion_width", coFloatOrPercent);
     def->label = L("External perimeters");