diff --git a/freecad/kiconnect/bases/BaseObject.py b/freecad/kiconnect/bases/BaseObject.py
index eae183d..6b216f5 100644
--- a/freecad/kiconnect/bases/BaseObject.py
+++ b/freecad/kiconnect/bases/BaseObject.py
@@ -1,4 +1,5 @@
 class BaseObject:
+    EXTENSIONS = []
     TYPE = None
 
     def __init__(self, feature):