diff --git a/core/includes/install.inc b/core/includes/install.inc
index be9fc6c245d02539b17f7665479779be0c334f2a..c3f53ec7f599b50c7669ed5ad457dfe1c2b2fc48 100644
--- a/core/includes/install.inc
+++ b/core/includes/install.inc
@@ -613,8 +613,6 @@ function drupal_check_profile($profile) {
         require_once $install_file;
       }
 
-      \Drupal::service('class_loader')->addPsr4('Drupal\\' . $module . '\\', \Drupal::root() . "/$module_path/src");
-
       if (function_exists($function)) {
         $requirements = array_merge($requirements, $function('install'));
       }