diff --git a/util/security/registry_jwt.py b/util/security/registry_jwt.py
index e6d39d656..05debf843 100644
--- a/util/security/registry_jwt.py
+++ b/util/security/registry_jwt.py
@@ -52,7 +52,7 @@ def decode_bearer_token(bearer_token, instance_keys, config):
   # Find the matching public key.
   public_key = instance_keys.get_service_key_public_key(kid)
   if public_key is None:
-    logger.error('Could not find requested service key %s', kid)
+    logger.error('Could not find requested service key %s with encoded JWT: %s', kid, bearer_token)
     raise InvalidBearerTokenException('Unknown service key')
 
   # Load the JWT returned.