diff --git a/t/test-lib.sh b/t/test-lib.sh
index 62136caee5..46e5c86f04 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1937,6 +1937,7 @@ test_lazy_prereq SHA1 '
 # Tests that verify the scheduler integration must set this locally
 # to avoid errors.
 GIT_TEST_MAINT_SCHEDULER="none:exit 1"
+export GIT_TEST_MAINT_SCHEDULER
 
 # Does this platform support `git fsmonitor--daemon`
 #