diff --git a/modules/node/node.module b/modules/node/node.module
index 2ce5863dba7..bfb5c24f9f1 100644
--- a/modules/node/node.module
+++ b/modules/node/node.module
@@ -1424,11 +1424,9 @@ function theme_node_filters($form) {
 /**
  * Process result from node administration filter form.
  */
-function node_filter_form_submit() {
-  global $form_values;
-  $op = $_POST['op'];
+function node_filter_form_submit($form_id, $form_values) {
   $filters = node_filters();
-  switch ($op) {
+  switch ($form_values['op']) {
     case t('Filter'):
     case t('Refine'):
       if (isset($form_values['filter'])) {