diff --git a/src/Mod/BIM/ArchWindow.py b/src/Mod/BIM/ArchWindow.py
index 5544c7a00b..87eacd9fea 100644
--- a/src/Mod/BIM/ArchWindow.py
+++ b/src/Mod/BIM/ArchWindow.py
@@ -358,7 +358,7 @@ class _Window(ArchComponent.Component):
         # Sill -> SillHeight property rename migration
         if hasattr(obj, "Sill"):
             obj.SillHeight = obj.Sill
-            obj.setPropertyStatus(prop, "-LockDynamic")
+            obj.setPropertyStatus("Sill", "-LockDynamic")
             obj.removeProperty("Sill")
 
     def loads(self, state):