diff --git a/core/tests/Drupal/FunctionalTests/Routing/LazyRouteProviderInstallTest.php b/core/tests/Drupal/FunctionalTests/Routing/LazyRouteProviderInstallTest.php
index 52d7341df6..bec7661a09 100644
--- a/core/tests/Drupal/FunctionalTests/Routing/LazyRouteProviderInstallTest.php
+++ b/core/tests/Drupal/FunctionalTests/Routing/LazyRouteProviderInstallTest.php
@@ -19,8 +19,10 @@ class LazyRouteProviderInstallTest extends BrowserTestBase {
    */
   public function testInstallation() {
     $this->container->get('module_installer')->install(['router_test']);
-    $this->assertEquals('/admin', \Drupal::state()->get('Drupal\lazy_route_provider_install_test\PluginManager'));
-    $this->assertEquals('/router_test/test1', \Drupal::state()->get('router_test_install'));
+    // Note that on DrupalCI the test site is installed in a sub directory so
+    // we cannot use ::assertEquals().
+    $this->assertRegExp('/\/admin$/', \Drupal::state()->get('Drupal\lazy_route_provider_install_test\PluginManager'));
+    $this->assertRegExp('/\/router_test\/test1$/', \Drupal::state()->get('router_test_install'));
   }
 
 }