diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/query/QueryPluginBase.php b/core/modules/views/lib/Drupal/views/Plugin/views/query/QueryPluginBase.php
index a5d583eaee95bea92e5f00320bb91c36012c2564..6014420be2022f6f488303cc7bf189abbe4ef19c 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/query/QueryPluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/query/QueryPluginBase.php
@@ -79,7 +79,7 @@ function execute(ViewExecutable $view) {  }
    * @param view $view
    *   The view which is executed.
    */
-  function add_signature(ViewExecutable $view) { }
+  public function addSignature(ViewExecutable $view) { }
 
   /**
    * Get aggregation info for group by queries.
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/query/Sql.php b/core/modules/views/lib/Drupal/views/Plugin/views/query/Sql.php
index c9f7237dc5102f55b7b6304d49d854922381dbcb..3898dc5d77350cb09bcbd150d390a00509266d64 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/query/Sql.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/query/Sql.php
@@ -1643,7 +1643,7 @@ function loadEntities(&$results) {
     }
   }
 
-  function add_signature(ViewExecutable $view) {
+  public function addSignature(ViewExecutable $view) {
     $view->query->add_field(NULL, "'" . $view->storage->id() . ':' . $view->current_display . "'", 'view_name');
   }
 
diff --git a/core/modules/views/lib/Drupal/views/ViewExecutable.php b/core/modules/views/lib/Drupal/views/ViewExecutable.php
index 3556195886134cab2c9a94211cf6990355b31aef..532c5b2ca13ddbdc12dfbd56fe93aec40ee3da87 100644
--- a/core/modules/views/lib/Drupal/views/ViewExecutable.php
+++ b/core/modules/views/lib/Drupal/views/ViewExecutable.php
@@ -1071,7 +1071,7 @@ public function build($display_id = NULL) {
     }
 
     if (config('views.settings')->get('sql_signature')) {
-      $this->query->add_signature($this);
+      $this->query->addSignature($this);
     }
 
     // Let modules modify the query just prior to finalizing it.