diff --git a/src/League/OAuth2/Server/Resource.php b/src/League/OAuth2/Server/Resource.php
index 849f481c..647441c9 100644
--- a/src/League/OAuth2/Server/Resource.php
+++ b/src/League/OAuth2/Server/Resource.php
@@ -194,7 +194,7 @@ class Resource
 
         $sessionScopes = $this->storages['session']->getScopes($this->accessToken);
         foreach ($sessionScopes as $scope) {
-            $this->sessionScopes[] = $scope['key'];
+            $this->sessionScopes[] = $scope['scope'];
         }
 
         return true;