diff --git a/anki/errors.py b/anki/errors.py
index 4a683a8b5..f7c09e137 100644
--- a/anki/errors.py
+++ b/anki/errors.py
@@ -16,4 +16,4 @@ class DeckRenameError(Exception):
     def __init__(self, description):
         self.description = description
     def __str__(self):
-        return "Couldn't rename deck: " + description
+        return "Couldn't rename deck: " + self.description