diff --git a/src/libslic3r/Model.hpp b/src/libslic3r/Model.hpp
index db7043769..f66300abc 100644
--- a/src/libslic3r/Model.hpp
+++ b/src/libslic3r/Model.hpp
@@ -680,7 +680,7 @@ protected:
     friend class SLAPrint;
     friend class Model;
 	friend class ModelObject;
-    friend static void model_volume_list_update_supports(ModelObject& model_object_dst, const ModelObject& model_object_new);
+    friend void model_volume_list_update_supports(ModelObject& model_object_dst, const ModelObject& model_object_new);
 
 	// Copies IDs of both the ModelVolume and its config.
 	explicit ModelVolume(const ModelVolume &rhs) = default;