diff --git a/app/views/settings/promotions/new.html.erb b/app/views/settings/promotions/new.html.erb
index 321aa4d1..13918973 100644
--- a/app/views/settings/promotions/new.html.erb
+++ b/app/views/settings/promotions/new.html.erb
@@ -10,7 +10,11 @@
     <%= render 'form', promotion: @promotion %>
 </div>
 <script>
-$("#promotion_promo_code").val(Math.random().toString(36).slice(5) + Math.random().toString(36).slice(5));
+ var r_id = Math.random().toString(36).slice(5);
+ if(r_id.length > 16){
+	r_id = r_id.substring(0, 15);
+	}
+ $("#promotion_promo_code").val(r_id);
 // $( "#fromtime" ).timepicker();
 // $( "#totime" ).timepicker({ 'scrollDefault': 'now' });
 </script>