diff --git a/core/lib/Drupal/Core/Cache/Cache.php b/core/lib/Drupal/Core/Cache/Cache.php
index f9a6165d4a..53aa1810ae 100644
--- a/core/lib/Drupal/Core/Cache/Cache.php
+++ b/core/lib/Drupal/Core/Cache/Cache.php
@@ -55,8 +55,7 @@ public static function mergeContexts(array $a = [], array $b = []) {
    *   The merged array of cache tags.
    */
   public static function mergeTags(array $a = [], array $b = []) {
-    assert(Inspector::assertAllStrings($a) && Inspector::assertAllStrings($b),
-      'Cache tags must be valid strings');
+    assert(Inspector::assertAllStrings($a) && Inspector::assertAllStrings($b), 'Cache tags must be valid strings');
 
     $cache_tags = array_unique(array_merge($a, $b));
     sort($cache_tags);