diff --git a/src/slic3r/GUI/PartPlate.cpp b/src/slic3r/GUI/PartPlate.cpp
index b44824111a..f08211e7c3 100644
--- a/src/slic3r/GUI/PartPlate.cpp
+++ b/src/slic3r/GUI/PartPlate.cpp
@@ -2624,6 +2624,8 @@ void PartPlate::generate_exclude_polygon(ExPolygon &exclude_polygon)
 			exclude_polygon.contour.append({ scale_(p(0)), scale_(p(1)) });
 		}
 	}
+
+	exclude_polygon.contour.make_counter_clockwise();
 }
 
 bool PartPlate::set_shape(const Pointfs& shape, const Pointfs& exclude_areas, Vec2d position, float height_to_lid, float height_to_rod)