diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/filter/Combine.php b/core/modules/views/lib/Drupal/views/Plugin/views/filter/Combine.php
index bdf71f4..d85c033 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/filter/Combine.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/filter/Combine.php
@@ -121,7 +121,7 @@ function op_not_ends($expression) {
     $this->query->add_where_expression($this->options['group'], "$expression NOT LIKE $placeholder", array($placeholder => '%' . db_like($this->value)));
   }
 
-  function op_not($expression) {
+  public function addNotLike($expression) {
     $placeholder = $this->placeholder();
     $this->query->add_where_expression($this->options['group'], "$expression NOT LIKE $placeholder", array($placeholder => '%' . db_like($this->value) . '%'));
   }
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/filter/String.php b/core/modules/views/lib/Drupal/views/Plugin/views/filter/String.php
index c71e14b..2f0c933 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/filter/String.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/filter/String.php
@@ -95,7 +95,7 @@ function operators() {
       'not' => array(
         'title' => t('Does not contain'),
         'short' => t('!has'),
-        'method' => 'op_not',
+        'method' => 'addNotLike',
         'values' => 1,
       ),
       'shorterthan' => array(
@@ -317,7 +317,7 @@ function op_not_ends($field) {
     $this->query->add_where($this->options['group'], $field, '%' . db_like($this->value), 'NOT LIKE');
   }
 
-  function op_not($field) {
+  public function addNotLike($field) {
     $this->query->add_where($this->options['group'], $field, '%' . db_like($this->value) . '%', 'NOT LIKE');
   }