diff --git a/core/lib/Drupal/Core/PreWarm/CachePreWarmer.php b/core/lib/Drupal/Core/PreWarm/CachePreWarmer.php
index f4bb641ac6..fdc0d8584e 100644
--- a/core/lib/Drupal/Core/PreWarm/CachePreWarmer.php
+++ b/core/lib/Drupal/Core/PreWarm/CachePreWarmer.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\Core\Prewarm;
+namespace Drupal\Core\PreWarm;
 
 use Drupal\Core\DependencyInjection\ClassResolverInterface;