diff --git a/config/kbin_routes/message.yaml b/config/kbin_routes/message.yaml
index 447b4adf5..cc6bb1e36 100644
--- a/config/kbin_routes/message.yaml
+++ b/config/kbin_routes/message.yaml
@@ -7,6 +7,8 @@ messages_single:
   controller: App\Controller\Message\MessageThreadController
   path: /profile/messages/{id}
   methods: [ GET, POST ]
+  requirements:
+    id: \d+
 
 messages_create:
   controller: App\Controller\Message\MessageCreateThreadController