diff --git a/aqt/browser.py b/aqt/browser.py
index 260487848..97605331d 100644
--- a/aqt/browser.py
+++ b/aqt/browser.py
@@ -1161,8 +1161,8 @@ update cards set usn=?, mod=?, did=? where odid=0 and id in """ + ids2str(
self.mw.progress.start()
res = self.mw.col.findDupes(fname, search)
t = ""
- t += _("Found %d duplicates in %d notes.") % (
- sum(len(r[1]) for r in res), len(res))
+ t += _("Found %(a)d duplicates in %(b)d notes.") % dict(
+ a=sum(len(r[1]) for r in res), b=len(res))
t += ""
for val, nids in res:
t += '- %s: %s' % (