diff --git a/core/modules/comment/comment.module b/core/modules/comment/comment.module
index 7fce17e..8066a4e 100644
--- a/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@ -638,7 +638,12 @@ function theme_comment_block() {
   }
 }
 
-function template_preprocess_comment_block(&$variables) {
+/**
+ * Implements hook_preprocess_HOOK().
+ *
+ * @see comment-block.html.twig
+ */
+function comment_preprocess_comment_block(&$variables) {
   $items = array();
   $number = variable_get('comment_block_count', 10);
   foreach (comment_get_recent($number) as $comment) {