diff --git a/commerce_gc.install b/commerce_gc.install
index 4e935b2..22c5ef8 100644
--- a/commerce_gc.install
+++ b/commerce_gc.install
@@ -50,7 +50,7 @@ function commerce_gc_schema() {
     'foreign keys' => array(
       'coupon_id' => array(
         'table' => 'commerce_coupon',
-        'column' => array('coupon_id' => 'coupon_id')
+        'columns' => array('coupon_id' => 'coupon_id')
       ),
     )
   );