diff --git a/src/api/routes/channels/#channel_id/messages/index.ts b/src/api/routes/channels/#channel_id/messages/index.ts
index 3e0a056e..2e1e3a28 100644
--- a/src/api/routes/channels/#channel_id/messages/index.ts
+++ b/src/api/routes/channels/#channel_id/messages/index.ts
@@ -430,7 +430,7 @@ router.post(
 			console.error("[Message] post-message handler failed", e),
 		);
 
-		return res.json(message);
+		return res.json(message.withSignedAttachments(req));
 	},
 );