diff --git a/anki/deck.py b/anki/deck.py
index fa42fde4e..f5cd5cfee 100644
--- a/anki/deck.py
+++ b/anki/deck.py
@@ -1784,6 +1784,7 @@ cardTags.tagId in %s""" % ids2str(ids)
     def startProgress(self, max=0, min=0, title=None):
         self.enableProgressHandler()
         runHook("startProgress", max, min, title)
+        self.s.flush()
 
     def updateProgress(self, label=None, value=None):
         runHook("updateProgress", label, value)