diff --git a/lib/push/crypto.js b/lib/push/crypto.js
--- a/lib/push/crypto.js
+++ b/lib/push/crypto.js
@@ -52,7 +52,7 @@
       return {
         resultPayload: unencryptedPayload,
         payloadSizeExceeded: payloadSizeValidator
-          ? payloadSizeValidator(unencryptedPayload)
+          ? !payloadSizeValidator(unencryptedPayload)
           : false,
       };
     }
@@ -95,7 +95,7 @@
     return {
       resultPayload,
       payloadSizeExceeded: payloadSizeValidator
-        ? payloadSizeValidator(resultPayload)
+        ? !payloadSizeValidator(resultPayload)
         : false,
     };
   }
@@ -196,7 +196,7 @@
     return {
       notification: unencryptedNotification,
       payloadSizeExceeded: notificationSizeValidator
-        ? notificationSizeValidator(unencryptedNotification)
+        ? !notificationSizeValidator(unencryptedNotification)
         : false,
     };
   }