diff --git a/lib/Doctrine/Export/Frontbase.php b/lib/Doctrine/Export/Frontbase.php
index cc90d6d59..821327478 100644
--- a/lib/Doctrine/Export/Frontbase.php
+++ b/lib/Doctrine/Export/Frontbase.php
@@ -161,7 +161,7 @@ class Doctrine_Export_Frontbase extends Doctrine_Export
      *
      * @return boolean
      */
-    public function alterTable($name, $changes, $check)
+    public function alterTable($name, array $changes, $check)
     {
         foreach ($changes as $changeName => $change){
             switch ($changeName) {