diff --git a/src/TokenRepository.php b/src/TokenRepository.php
index b07005725..26e624244 100644
--- a/src/TokenRepository.php
+++ b/src/TokenRepository.php
@@ -56,7 +56,7 @@ public function revokeAccessToken($id)
      */
     public function isAccessTokenRevoked($id)
     {
-        return Token::where('id', $id)->where('revoked', 1)->exists();
+        return Token::where('id', $id)->where('revoked', true)->exists();
     }
 
     /**