diff --git a/waku/node/v2/waku_types.nim b/waku/node/v2/waku_types.nim
index b5df888a4..0af484955 100644
--- a/waku/node/v2/waku_types.nim
+++ b/waku/node/v2/waku_types.nim
@@ -24,7 +24,7 @@ type
   WakuMessage* = object
     payload*: seq[byte]
     contentTopic*: ContentTopic
-    version*: string
+    version*: uint32
 
   MessageNotificationHandler* = proc(topic: string, msg: WakuMessage): Future[
       void] {.gcsafe, closure.}