diff --git a/zerver/webhooks/dialogflow/view.py b/zerver/webhooks/dialogflow/view.py
index a22fd18148..d87ba13745 100644
--- a/zerver/webhooks/dialogflow/view.py
+++ b/zerver/webhooks/dialogflow/view.py
@@ -14,7 +14,7 @@ from zerver.models import UserProfile, get_user_profile_by_email
 @has_request_variables
 def api_dialogflow_webhook(request: HttpRequest, user_profile: UserProfile,
                            payload: Dict[str, Any]=REQ(argument_type='body'),
-                           email: str=REQ(default='foo')) -> HttpResponse:
+                           email: str=REQ()) -> HttpResponse:
     status = payload["status"]["code"]
 
     if status == 200: