diff --git a/mqtt/index.d.ts b/mqtt/index.d.ts
index 62e622e81d..f52aede457 100644
--- a/mqtt/index.d.ts
+++ b/mqtt/index.d.ts
@@ -238,7 +238,7 @@ declare namespace mqtt {
         /**
          * get last message id. This is for sent messages only.
          */
-        getLastMessageId(): number
+        getLastMessageId(): number;
     }
 
     /**