diff --git a/dom/wappush/src/gonk/CpPduHelper.jsm b/dom/wappush/src/gonk/CpPduHelper.jsm
index 728a31e32d2..e2038fe5f60 100644
--- a/dom/wappush/src/gonk/CpPduHelper.jsm
+++ b/dom/wappush/src/gonk/CpPduHelper.jsm
@@ -187,7 +187,6 @@ this.Authenticator = {
       mac: mac.toUpperCase(),
       data: wbxml
     };
-    authInfo.data.length = wbxml.length;
 
     switch (authInfo.sec) {
       case "NETWPIN":