diff --git a/t/t0029-core-unsetenvvars.sh b/t/t0029-core-unsetenvvars.sh
index b138e1d..4e8e90d 100755
--- a/t/t0029-core-unsetenvvars.sh
+++ b/t/t0029-core-unsetenvvars.sh
@@ -12,8 +12,7 @@
 fi
 
 test_expect_success 'setup' '
-	mkdir -p "$TRASH_DIRECTORY/.git/hooks" &&
-	write_script "$TRASH_DIRECTORY/.git/hooks/pre-commit" <<-\EOF
+	test_hook --setup pre-commit <<-\EOF
 	echo $HOBBES >&2
 	EOF
 '