diff --git a/src/Mod/Sketcher/App/SketchObject.cpp b/src/Mod/Sketcher/App/SketchObject.cpp
index fca9b5c34d..f8ab21acd0 100644
--- a/src/Mod/Sketcher/App/SketchObject.cpp
+++ b/src/Mod/Sketcher/App/SketchObject.cpp
@@ -8891,6 +8891,7 @@ void SketchObject::onChanged(const App::Property* prop)
             if (ExternalGeometry.getSize() == 0) {
                 delConstraintsToExternal();
             }
+            rebuildExternalGeometry();
         }
     }