diff --git a/litellm/proxy/custom_validate.py b/litellm/proxy/custom_validate.py
index c4e1478791a..c80ffa4fe95 100644
--- a/litellm/proxy/custom_validate.py
+++ b/litellm/proxy/custom_validate.py
@@ -1,2 +1,5 @@
-def my_custom_validate(token: str) -> bool:
-    return False
+from typing import Literal
+
+
+def my_custom_validate(token: str) -> Literal[True]:
+    raise Exception("Custom validate failed")