diff --git a/discord/webhook/async_.py b/discord/webhook/async_.py
index d1ed1ade01..fb14337e7d 100644
--- a/discord/webhook/async_.py
+++ b/discord/webhook/async_.py
@@ -1405,7 +1405,7 @@ async def send(
 
         return msg
 
-    async def fetch_message(self, id: int) -> WebhookMessage:
+    async def fetch_message(self, id: int, /) -> WebhookMessage:
         """|coro|
 
         Retrieves a single :class:`~discord.WebhookMessage` owned by this webhook.