diff --git a/anki/deck.py b/anki/deck.py
index 76603083c..9784160db 100644
--- a/anki/deck.py
+++ b/anki/deck.py
@@ -2754,6 +2754,7 @@ where interval < 1""")
         if deck.version < 27:
             DeckStorage._addIndices(deck)
             deck.updateCardTags()
+            deck.updateAllPriorities()
             deck.version = 27
             deck.s.commit()
         if deck.version < 28: