diff --git a/src/Http/Middleware/MercureHandler.php b/src/Http/Middleware/MercureHandler.php
index 827e861..2027343 100644
--- a/src/Http/Middleware/MercureHandler.php
+++ b/src/Http/Middleware/MercureHandler.php
@@ -182,7 +182,7 @@ class MercureHandler
 
         // Put an id in there if none already
         if (empty($data['id']) || $this->config->getOverwriteMessageIds()) {
-            $data['id'] = (string)Uuid::v7();
+            $data['id'] = "urn:uuid:".(string)Uuid::v7();
         }
 
         // Attempt to create the message
@@ -192,7 +192,7 @@ class MercureHandler
             $this->topicManager->publish($message);
         });
 
-        return Response::plaintext("urn:uuid:".$message->id."\n");
+        return Response::plaintext($message->id."\n");
     }
 
     private function checkTopicClaims(string|array $topic, array $claims): bool