diff --git a/src/Oauth2/Server.php b/src/Oauth2/Server.php
index 7992aa65..ee520c6b 100644
--- a/src/Oauth2/Server.php
+++ b/src/Oauth2/Server.php
@@ -92,7 +92,7 @@ maintenance of the server.',
      * @param  array $authParams Optional array of parsed $_GET keys
      * @return array             Authorise request parameters
      */
-    public function checkClientAuthoriseParams(array $authParams = null)
+    public function checkClientAuthoriseParams($authParams = null)
     {
         $params = array();