diff --git a/t/t3800-mktag.sh b/t/t3800-mktag.sh
index bb300d567d..048000cda9 100755
--- a/t/t3800-mktag.sh
+++ b/t/t3800-mktag.sh
@@ -350,7 +350,8 @@ EOF
 
 test_expect_success 'create valid tag' '
 	git mktag <tag.sig >hash &&
-	git update-ref refs/tags/mytag $(cat hash) $(test_oid zero)
+	git update-ref refs/tags/mytag $(cat hash) $(test_oid zero) &&
+	git fsck --strict
 '
 
 test_done