diff --git a/src/Mod/Part/App/TopoShapePy.xml b/src/Mod/Part/App/TopoShapePy.xml
index 44a8b66cb7..e99e2e6bc3 100644
--- a/src/Mod/Part/App/TopoShapePy.xml
+++ b/src/Mod/Part/App/TopoShapePy.xml
@@ -289,7 +289,7 @@ Return a list of sub-shapes that are direct children of this shape.
         </UserDocu>
       </Documentation>
     </Methode>
-    <Methode Name="ancestorsOfType">
+    <Methode Name="ancestorsOfType" Const="true">
       <Documentation>
         <UserDocu>ancestorsOfType(shape, shape type) -> list
 For a sub-shape of this shape get its ancestors of a type.