diff --git a/lib/Doctrine/I18n.php b/lib/Doctrine/I18n.php
index 98ddbb2b5..08beab164 100644
--- a/lib/Doctrine/I18n.php
+++ b/lib/Doctrine/I18n.php
@@ -74,6 +74,7 @@ class Doctrine_I18n extends Doctrine_Plugin
 
             unset($def['autoincrement']);
             unset($def['sequence']);
+            unset($def['unique']);
 
             $fk[$column] = $def;
         }