diff --git a/lib/push/crypto.js b/lib/push/crypto.js
--- a/lib/push/crypto.js
+++ b/lib/push/crypto.js
@@ -196,7 +196,7 @@
     return {
       notification: unencryptedNotification,
       payloadSizeExceeded: notificationSizeValidator
-        ? notificationSizeValidator(unencryptedNotification)
+        ? !notificationSizeValidator(unencryptedNotification)
         : false,
     };
   }