diff --git a/t/t1301-shared-repo.sh b/t/t1301-shared-repo.sh
index de42d21c92..86ed901e0e 100755
--- a/t/t1301-shared-repo.sh
+++ b/t/t1301-shared-repo.sh
@@ -112,6 +112,7 @@ do
 done
 
 test_expect_success POSIXPERM 'git reflog expire honors core.sharedRepository' '
+	umask 077 &&
 	git config core.sharedRepository group &&
 	git reflog expire --all &&
 	actual="$(ls -l .git/logs/refs/heads/master)" &&