diff --git a/src/Mod/Part/App/Geometry.h b/src/Mod/Part/App/Geometry.h
index b31b4dcd0b..54c40683a3 100644
--- a/src/Mod/Part/App/Geometry.h
+++ b/src/Mod/Part/App/Geometry.h
@@ -93,6 +93,7 @@ public:
     bool Construction;
     /// returns the tag of the geometry object
     boost::uuids::uuid getTag() const;
+protected:
     /// create a new tag for the geometry object
     void createNewTag();
     /// copies the tag from the geometry passed as a parameter to this object