diff --git a/oldanki/deck.py b/oldanki/deck.py
index 85f0e5245..8017a7b49 100644
--- a/oldanki/deck.py
+++ b/oldanki/deck.py
@@ -1926,6 +1926,8 @@ and c.id in %s""" % ids2str(ids))
 
     def updateCardQACache(self, ids, dirty=True):
         "Given a list of (cardId, cardModelId, factId, modId), update q/a cache."
+        # we don't need the q/a cache for upgrading
+        return
         if dirty:
             mod = ", modified = %f" % time.time()
         else: