diff -u b/relaxed.services.yml b/relaxed.services.yml
--- b/relaxed.services.yml
+++ b/relaxed.services.yml
@@ -67 +67,2 @@
-    - { name: event_subscriber }
+      - { name: event_subscriber }
+    arguments: ['@module_handler', '@config.factory']
diff -u b/src/Routing/RouteSubscriber.php b/src/Routing/RouteSubscriber.php
--- b/src/Routing/RouteSubscriber.php
+++ b/src/Routing/RouteSubscriber.php
@@ -2,6 +2,8 @@
 
 namespace Drupal\relaxed\Routing;
 
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Routing\RouteSubscriberBase;
 use Symfony\Component\Routing\RouteCollection;
 
@@ -11,13 +13,43 @@
 class RouteSubscriber extends RouteSubscriberBase {
 
   /**
+   * The module handler.
+   *
+   * @var \Drupal\Core\Extension\ModuleHandlerInterface
+   */
+  protected $moduleHandler;
+
+  /**
+   * The config factory.
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
+  /**
+   * Constructs a ModuleRouteSubscriber object.
+   *
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler.
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The config factory.
+   */
+  public function __construct(ModuleHandlerInterface $module_handler, ConfigFactoryInterface $config_factory) {
+    $this->moduleHandler = $module_handler;
+    $this->configFactory = $config_factory;
+  }
+
+  /**
    * {@inheritdoc}
    */
   protected function alterRoutes(RouteCollection $collection) {
-    // Skips redirect on the rest relaxed routers.
-    foreach ($collection->all() as $routerName => $route) {
-      if (stripos($routerName, 'relaxed') !== FALSE) {
-        $route->setDefault('_disable_route_normalizer', TRUE);
+    // Skips redirect on the relaxed routes if Redirect module is installed.
+    if ($this->moduleHandler->moduleExists('redirect')
+      && $this->configFactory->get('redirect.settings')->get('route_normalizer_enabled')) {
+      foreach ($collection->all() as $name => $route) {
+        if (stripos($name, 'relaxed') !== FALSE) {
+          $route->setDefault('_disable_route_normalizer', TRUE);
+        }
       }
     }
   }