diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index ada731be60..0d94730924 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -1902,7 +1902,7 @@ test_subcommand_flex () {
 		shift
 	fi
 
-	local expr="$(printf '"%s",.*' "$@")"
+	local expr="$(printf '"%s".*' "$@")"
 
 	if test -n "$negate"
 	then