diff --git a/src/Mod/Part/AttachmentEditor/TaskAttachmentEditor.py b/src/Mod/Part/AttachmentEditor/TaskAttachmentEditor.py
index 270d894c55..1b6a6edae6 100644
--- a/src/Mod/Part/AttachmentEditor/TaskAttachmentEditor.py
+++ b/src/Mod/Part/AttachmentEditor/TaskAttachmentEditor.py
@@ -33,7 +33,7 @@ try:
     from Show import TempoVis
     from Show.DepGraphTools import getAllDependent
 except ImportError as err:
-    def TempoVis(doc):
+    def TempoVis(doc,tag):
         return None
     def getAllDependent(feature):
         return []