diff --git a/anki/sync.py b/anki/sync.py
index b33f966db..e27d2a7d4 100644
--- a/anki/sync.py
+++ b/anki/sync.py
@@ -140,7 +140,7 @@ select count() from notes where id not in (select distinct nid from cards)""")
             assert m['usn'] != -1
         self.col.sched.reset()
         return [
-            self.col.sched.repCounts(),
+            list(self.col.sched.repCounts()),
             self.col.db.scalar("select count() from cards"),
             self.col.db.scalar("select count() from notes"),
             self.col.db.scalar("select count() from revlog"),