diff --git a/waku/v2/protocol/topic.go b/waku/v2/protocol/topic.go
index 11ba7cbd..2c9aba4f 100644
--- a/waku/v2/protocol/topic.go
+++ b/waku/v2/protocol/topic.go
@@ -41,7 +41,7 @@ func StringToContentTopic(s string) (ContentTopic, error) {
 		return ContentTopic{}, ErrInvalidFormat
 	}
 
-	vNum, err := strconv.ParseUint(p[2], 10, 64)
+	vNum, err := strconv.ParseUint(p[2], 10, 32)
 	if err != nil {
 		return ContentTopic{}, ErrInvalidFormat
 	}