diff --git a/web/skins/classic/views/js/filter.js b/web/skins/classic/views/js/filter.js
index 5765a0e76..e7979db15 100644
--- a/web/skins/classic/views/js/filter.js
+++ b/web/skins/classic/views/js/filter.js
@@ -378,7 +378,7 @@ function delTerm( element ) {
 }
 
 function debugFilter() {
-  getModal('filterdebug', 'fid='+filterid);
+  getModal('filterdebug', $j(form).serialize());
 }
 
 function manageModalBtns(id) {