diff --git a/zerver/webhooks/ifttt/view.py b/zerver/webhooks/ifttt/view.py
index 3deb675183..38c0ea81cc 100644
--- a/zerver/webhooks/ifttt/view.py
+++ b/zerver/webhooks/ifttt/view.py
@@ -11,10 +11,9 @@ from zerver.models import UserProfile
 
 @api_key_only_webhook_view('IFTTT')
 @has_request_variables
-def api_iftt_app_webhook(request, user_profile,
-                         payload=REQ(argument_type='body'),
-                         stream=REQ(default='ifttt')):
-    # type: (HttpRequest, UserProfile, Dict[str, Any], str) -> HttpResponse
+def api_iftt_app_webhook(request: HttpRequest, user_profile: UserProfile,
+                         payload: Dict[str, Any]=REQ(argument_type='body'),
+                         stream: str=REQ(default='ifttt')) -> HttpResponse:
     subject = payload.get('subject')
     content = payload.get('content')
     if subject is None: