diff --git a/core/lib/Drupal/Core/Extension/ModuleInstaller.php b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
index 84aacb5..0048ebc 100644
--- a/core/lib/Drupal/Core/Extension/ModuleInstaller.php
+++ b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
@@ -295,7 +295,7 @@ public function install(array $module_list, $enable_dependencies = TRUE) {
 
     // If any modules were newly installed, invoke hook_modules_installed().
     if (!empty($modules_installed)) {
-      \Drupal::service('router.builder')->setRebuildNeeded();
+      \Drupal::service('router.builder')->rebuild();
       $this->moduleHandler->invokeAll('modules_installed', array($modules_installed));
     }
 
@@ -437,7 +437,7 @@ public function uninstall(array $module_list, $uninstall_dependents = TRUE) {
       $schema_store = \Drupal::keyValue('system.schema');
       $schema_store->delete($module);
     }
-    \Drupal::service('router.builder')->setRebuildNeeded();
+    \Drupal::service('router.builder')->rebuild();
     drupal_get_installed_schema_version(NULL, TRUE);
 
     // Let other modules react.