diff --git a/plugins/tps/reklama/components/advertisement/default.htm b/plugins/tps/reklama/components/advertisement/default.htm
index 1ad7cef7f..eb7ee093f 100644
--- a/plugins/tps/reklama/components/advertisement/default.htm
+++ b/plugins/tps/reklama/components/advertisement/default.htm
@@ -4,7 +4,7 @@
 <script>
     $.request('{{__SELF__}}::onDisplay',{
         data:{random:{{__SELF__.property('random')}}
-    {% if __SELF__.property('css_class') %},css_class:{{__SELF__.property('css_class')}} {% endif %}
+    {% if __SELF__.property('css_class') %},css_class:'{{__SELF__.property('css_class')}}' {% endif %}
         }
     });
 </script>