diff --git a/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_presidio_union_fix.py b/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_presidio_union_fix.py
index ff31249665..841288948d 100644
--- a/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_presidio_union_fix.py
+++ b/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_presidio_union_fix.py
@@ -15,7 +15,7 @@ class PiiAction(str, Enum):
     MASK = "MASK"
 
 
-def test_presidio_union_type_fix():
+def test_presidio_union_type_fix() -> None:
     """Test that Union[PiiEntityType, str] allows both enum and string entity types"""
 
     # This is the core fix - mixed entity types in pii_entities_config