diff --git a/endpoints/api.py b/endpoints/api.py
index 3108ce537..8160c730f 100644
--- a/endpoints/api.py
+++ b/endpoints/api.py
@@ -1573,7 +1573,7 @@ def delete_build_trigger(namespace, repository, trigger_uuid):
         handler.deactivate(trigger.auth_token, config_dict)
       except TriggerDeactivationException as ex:
         # We are just going to eat this error
-        logger.warning('Trigger deactivation problem.', ex)
+        logger.warning('Trigger deactivation problem: %s', ex)
 
       log_action('delete_repo_trigger', namespace, 
                  {'repo': repository, 'trigger_id': trigger_uuid,