diff --git a/tests/test_litellm/llms/vertex_ai/test_vertex_ai_common_utils.py b/tests/test_litellm/llms/vertex_ai/test_vertex_ai_common_utils.py
index 624646ab328..dddc95bf54a 100644
--- a/tests/test_litellm/llms/vertex_ai/test_vertex_ai_common_utils.py
+++ b/tests/test_litellm/llms/vertex_ai/test_vertex_ai_common_utils.py
@@ -993,7 +993,7 @@ def test_construct_target_url_with_version_prefix():
         ),
     ],
 )
-def test_construct_target_url_versionless_project_route_gets_api_version(requested_route, expected_url):
+def test_construct_target_url_versionless_project_route_gets_api_version(requested_route: str, expected_url: str) -> None:
     from litellm.llms.vertex_ai.common_utils import construct_target_url
 
     target_url = construct_target_url(