diff --git a/awx/main/tests/functional/test_inventory_source_injectors.py b/awx/main/tests/functional/test_inventory_source_injectors.py
index dc54301d01..fc28c92294 100644
--- a/awx/main/tests/functional/test_inventory_source_injectors.py
+++ b/awx/main/tests/functional/test_inventory_source_injectors.py
@@ -216,6 +216,7 @@ def test_inventory_update_injected_content(this_kind, inventory, fake_credential
         env.pop('ANSIBLE_COLLECTIONS_PATHS', None)  # collection paths not relevant to this test
         env.pop('PYTHONPATH')
         env.pop('VIRTUAL_ENV')
+        env.pop('PROOT_TMP_DIR')
         base_dir = os.path.join(DATA, 'plugins')
         if not os.path.exists(base_dir):
             os.mkdir(base_dir)