diff --git a/lib/Doctrine/Export.php b/lib/Doctrine/Export.php
index f21da9f63..f9a9b5f76 100644
--- a/lib/Doctrine/Export.php
+++ b/lib/Doctrine/Export.php
@@ -698,7 +698,7 @@ class Doctrine_Export extends Doctrine_Connection_Module
      * @param array $definition     foreign key definition
      * @return string
      */
-    public function getAdvancedForeignKeyOptions($definition)
+    public function getAdvancedForeignKeyOptions(array $definition)
     {
         $query = '';
         if ( ! empty($definition['onUpdate'])) {