diff --git a/src/OAuth/Common/Token/AbstractToken.php b/src/OAuth/Common/Token/AbstractToken.php
index 2ebdc023..3604a2f6 100644
--- a/src/OAuth/Common/Token/AbstractToken.php
+++ b/src/OAuth/Common/Token/AbstractToken.php
@@ -125,6 +125,6 @@ public function isExpired()
 
     public function __sleep()
     {
-        return ['accessToken'];
+        return ['accessToken', 'endOfLife'];
     }
 }