diff --git a/backend/core/character/GF/extra/dark_knight.py b/backend/core/character/GF/extra/dark_knight.py
index a3b1e16c..cae9e10e 100644
--- a/backend/core/character/GF/extra/dark_knight.py
+++ b/backend/core/character/GF/extra/dark_knight.py
@@ -2222,7 +2222,7 @@ class classChange(Character):
                                 'combo': getattr(i, 'comboCol', None),
                             }
                         )
-        for comboCol in [0,1,2,3,4,5]:
+        for comboCol in range(6):
             skills = list(filter(lambda x: x['combo'] == comboCol, skillInfos))
             cdList = [x['cd'] for x in skills]
             cdRecoverList = [x['cdRecover'] for x in skills]