diff --git a/src/UrlHelperMiddleware.php b/src/UrlHelperMiddleware.php
index 9a1ac4c..5b9f4bb 100644
--- a/src/UrlHelperMiddleware.php
+++ b/src/UrlHelperMiddleware.php
@@ -4,7 +4,6 @@
 
 namespace Mezzio\Helper;
 
-use Mezzio\Helper\UrlHelper;
 use Mezzio\Router\RouteResult;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
@@ -16,7 +15,7 @@
  */
 class UrlHelperMiddleware implements MiddlewareInterface
 {
-    public function __construct(private UrlHelper $helper)
+    public function __construct(private UrlHelperInterface $helper)
     {
     }
 
diff --git a/src/UrlHelperMiddlewareFactory.php b/src/UrlHelperMiddlewareFactory.php
index a4505b4..7b64f5c 100644
--- a/src/UrlHelperMiddlewareFactory.php
+++ b/src/UrlHelperMiddlewareFactory.php
@@ -46,7 +46,7 @@ public function __invoke(ContainerInterface $container): UrlHelperMiddleware
         }
 
         $helper = $container->get($this->urlHelperServiceName);
-        assert($helper instanceof UrlHelper);
+        assert($helper instanceof UrlHelperInterface);
 
         return new UrlHelperMiddleware($helper);
     }
diff --git a/test/UrlHelperMiddlewareFactoryTest.php b/test/UrlHelperMiddlewareFactoryTest.php
index 3fe09c9..14eb000 100644
--- a/test/UrlHelperMiddlewareFactoryTest.php
+++ b/test/UrlHelperMiddlewareFactoryTest.php
@@ -6,6 +6,7 @@
 
 use Mezzio\Helper\Exception\MissingHelperException;
 use Mezzio\Helper\UrlHelper;
+use Mezzio\Helper\UrlHelperInterface;
 use Mezzio\Helper\UrlHelperMiddleware;
 use Mezzio\Helper\UrlHelperMiddlewareFactory;
 use PHPUnit\Framework\MockObject\MockObject;
@@ -90,4 +91,16 @@ public function testFactoryAllowsSerialization(): void
         self::assertInstanceOf(UrlHelperMiddlewareFactory::class, $factory);
         self::assertAttributeSame('MyUrlHelper', 'urlHelperServiceName', $factory);
     }
+
+    public function testFactoryAllowsCustomUrlHelperInterfaceImplementations(): void
+    {
+        $helper = $this->createMock(UrlHelperInterface::class);
+        $this->injectContainer('MyUrlHelper', $helper);
+        $factory = new UrlHelperMiddlewareFactory('MyUrlHelper');
+
+        $middleware = $factory($this->container);
+
+        self::assertInstanceOf(UrlHelperMiddleware::class, $middleware);
+        self::assertAttributeSame($helper, 'helper', $middleware);
+    }
 }
diff --git a/test/UrlHelperMiddlewareTest.php b/test/UrlHelperMiddlewareTest.php
index bf497aa..f63a3d2 100644
--- a/test/UrlHelperMiddlewareTest.php
+++ b/test/UrlHelperMiddlewareTest.php
@@ -4,7 +4,7 @@
 
 namespace MezzioTest\Helper;
 
-use Mezzio\Helper\UrlHelper;
+use Mezzio\Helper\UrlHelperInterface;
 use Mezzio\Helper\UrlHelperMiddleware;
 use Mezzio\Router\RouteResult;
 use PHPUnit\Framework\MockObject\MockObject;
@@ -16,8 +16,8 @@
 /** @covers \Mezzio\Helper\UrlHelperMiddleware */
 final class UrlHelperMiddlewareTest extends TestCase
 {
-    /** @var UrlHelper&MockObject */
-    private UrlHelper $helper;
+    /** @var UrlHelperInterface&MockObject */
+    private UrlHelperInterface $helper;
 
     private UrlHelperMiddleware $middleware;
 
@@ -25,7 +25,7 @@ protected function setUp(): void
     {
         parent::setUp();
 
-        $this->helper = $this->createMock(UrlHelper::class);
+        $this->helper = $this->createMock(UrlHelperInterface::class);
 
         $this->middleware = new UrlHelperMiddleware($this->helper);
     }