diff --git a/wcs/formdef.py b/wcs/formdef.py
index 10e67464e..7f87efa7d 100644
--- a/wcs/formdef.py
+++ b/wcs/formdef.py
@@ -159,7 +159,7 @@ class FormDef(StorableObject):
         suffix_no = 0
         while True:
             try:
-                formdef = self.get_by_urlname(new_url_name)
+                formdef = self.get_by_urlname(new_url_name, ignore_migration=True)
             except KeyError:
                 break
             if formdef.id == self.id: