diff --git a/t/t7300-clean.sh b/t/t7300-clean.sh
index 32e96da7e37e5087a2dedba392cfa304a04beb4f..27557d64f35bf7d53d52ee7583258daa24ef68b7 100755
--- a/t/t7300-clean.sh
+++ b/t/t7300-clean.sh
@@ -499,7 +499,7 @@ test_expect_success 'should not clean submodules' '
 	test_path_is_missing to_clean
 '
 
-test_expect_success 'should avoid cleaning possible submodules' '
+test_expect_success POSIXPERM 'should avoid cleaning possible submodules' '
 	rm -fr to_clean possible_sub1 &&
 	mkdir to_clean possible_sub1 &&
 	test_when_finished "rm -rf possible_sub*" &&