diff --git a/Migration/Version201602161300.php b/Migration/Version201602161300.php
index b9a912a..8f7056d 100644
--- a/Migration/Version201602161300.php
+++ b/Migration/Version201602161300.php
@@ -27,8 +27,8 @@ public function up(Schema $schema)
     {
         // this up() migration is auto-generated, please modify it to your needs
         $table = $schema->getTable('plg_product_maker');
-        if (!$table->hasColumn('maker_url')) {
-            $table->addColumn('maker_url', 'text', array('notnull' => true));
+        if ($table->hasColumn('maker_url')) {
+            $table->changeColumn('maker_url', array('NotNull' => false));
         }
     }