diff --git a/t/t5566-push-group.sh b/t/t5566-push-group.sh
index b9962946c7..32b8c82cea 100755
--- a/t/t5566-push-group.sh
+++ b/t/t5566-push-group.sh
@@ -2,6 +2,9 @@
 
 test_description='push to remote group'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=default
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '