diff --git a/core/modules/user/src/Plugin/LanguageNegotiation/LanguageNegotiationUserAdmin.php b/core/modules/user/src/Plugin/LanguageNegotiation/LanguageNegotiationUserAdmin.php
index c00509f..4a6ea08 100644
--- a/core/modules/user/src/Plugin/LanguageNegotiation/LanguageNegotiationUserAdmin.php
+++ b/core/modules/user/src/Plugin/LanguageNegotiation/LanguageNegotiationUserAdmin.php
@@ -12,6 +12,7 @@
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 use Symfony\Component\Routing\Exception\ResourceNotFoundException;
+use Symfony\Component\Routing\Matcher\RequestMatcherInterface;
 use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
 
 /**
@@ -131,7 +132,12 @@ protected function isAdminPath(Request $request) {
           // prefixes and other path components that inbound processing would
           // clear out, so we can attempt to load the route clearly.
           $path = $this->pathProcessorManager->processInbound(urldecode(rtrim($request->getPathInfo(), '/')), $request);
-          $attributes = $this->router->match($path);
+          if ($this->router instanceof RequestMatcherInterface) {
+            $attributes = $this->router->matchRequest(Request::create($path, $request->getMethod()));
+          }
+          else {
+            $attributes = $this->router->match($path);
+          }
         }
         catch (ResourceNotFoundException $e) {
           return FALSE;