diff --git a/core/modules/comment/lib/Drupal/comment/CommentStatistics.php b/core/modules/comment/lib/Drupal/comment/CommentStatistics.php
index 14980b7..fca3657 100644
--- a/core/modules/comment/lib/Drupal/comment/CommentStatistics.php
+++ b/core/modules/comment/lib/Drupal/comment/CommentStatistics.php
@@ -140,7 +140,7 @@ public function create(ContentEntityInterface $entity, $fields) {
    * {@inheritdoc}
    */
   public function getMaximumCount($entity_type = 'node') {
-    return $this->database->query('SELECT MAX(comment_count) FROM {comment_entity_statistics} WHERE entity_type = :entity_type', $entity_type)->fetchField();
+    return $this->database->query('SELECT MAX(comment_count) FROM {comment_entity_statistics} WHERE entity_type = :entity_type', array(':entity_type' => $entity_type))->fetchField();
   }
 
   /**