diff --git a/anki/decks.py b/anki/decks.py
index da394075e..74c16c5de 100644
--- a/anki/decks.py
+++ b/anki/decks.py
@@ -227,7 +227,7 @@ class DeckManager(object):
         for grp in self.all():
             if grp['name'].startswith(g['name'] + "::"):
                 grp['name'] = grp['name'].replace(g['name']+ "::",
-                                                  newName + "::")
+                                                  newName + "::", 1)
                 self.save(grp)
         # adjust name
         g['name'] = newName