diff --git a/t/t3700-add.sh b/t/t3700-add.sh
index 0a962a60f2..16ab2da8a2 100755
--- a/t/t3700-add.sh
+++ b/t/t3700-add.sh
@@ -380,7 +380,7 @@ test_expect_success 'no file status change if no pathspec is given' '
 '
 
 test_expect_success 'no file status change if no pathspec is given in subdir' '
-	mkdir sub &&
+	mkdir -p sub &&
 	(
 		cd sub &&
 		>sub-foo1 &&