diff --git a/t/t4018-diff-funcname.sh b/t/t4018-diff-funcname.sh
index 9675bc17db2..cefe329aea7 100755
--- a/t/t4018-diff-funcname.sh
+++ b/t/t4018-diff-funcname.sh
@@ -49,6 +49,7 @@ diffpatterns="
 	ruby
 	rust
 	tex
+	default
 	custom1
 	custom2
 	custom3