diff --git a/src/oauth2server/Server.php b/src/oauth2server/Server.php
index 2ef9da79..20931995 100644
--- a/src/oauth2server/Server.php
+++ b/src/oauth2server/Server.php
@@ -79,7 +79,7 @@ class Server
      * @param  object $db A class that implements OAuth2ServerDatabase
      * @return void
      */
-    public function registerDbAbstractor(object $db)
+    public function registerDbAbstractor($db)
     {
         $this->db = $db;
     }