diff --git a/src/ServiceProvider.php b/src/ServiceProvider.php
index 6b17041f..20c3e167 100644
--- a/src/ServiceProvider.php
+++ b/src/ServiceProvider.php
@@ -53,12 +53,15 @@ protected function registerRouterMacro()
     protected function registerMiddleware()
     {
         $kernel = $this->app[Kernel::class];
+        $group = Config::get('inertia.middleware_group', 'web');
 
+        // Laravel >= 6.9.0
         if (method_exists($kernel, 'appendMiddlewareToGroup')) {
-            $kernel->appendMiddlewareToGroup(
-                Config::get('inertia.middleware_group', 'web'),
-                Middleware::class
-            );
+            $kernel->appendMiddlewareToGroup($group, Middleware::class);
+
+        // Laravel >= 5.4.4 && < 6.9.0
+        } elseif ($this->app[Router::class]->hasMiddlewareGroup($group)) {
+            $this->app[Router::class]->pushMiddlewareToGroup($group, Middleware::class);
         }
     }
 
diff --git a/tests/ServiceProviderTest.php b/tests/ServiceProviderTest.php
index fa6905bc..d5120fe3 100644
--- a/tests/ServiceProviderTest.php
+++ b/tests/ServiceProviderTest.php
@@ -6,6 +6,7 @@
 use Inertia\Inertia;
 use Inertia\Middleware;
 use Illuminate\Http\Request;
+use Illuminate\Routing\Router;
 use Illuminate\Support\MessageBag;
 use Illuminate\Support\Facades\App;
 use Illuminate\Support\ViewErrorBag;
@@ -48,11 +49,16 @@ public function test_route_macro_is_registered()
         $this->assertEquals(['component' => 'User/Edit', 'props' => ['user' => ['name' => 'Jonathan']]], $route->defaults);
     }
 
-    public function test_middleware_is_registered()
+    public function test_middleware_is_registered_to_the_web_group()
     {
-        $middleware = App::make(Kernel::class)->getMiddlewareGroups();
+        $webRoute = Route::middleware('web')->get('/');
+        $apiRoute = Route::middleware('api')->get('/');
 
-        $this->assertContains(Middleware::class, $middleware['web']);
+        $webMiddleware = App::make(Router::class)->gatherRouteMiddleware($webRoute);
+        $apiMiddleware = App::make(Router::class)->gatherRouteMiddleware($apiRoute);
+
+        $this->assertContains(Middleware::class, $webMiddleware);
+        $this->assertNotContains(Middleware::class, $apiMiddleware);
     }
 
     public function test_validation_errors_are_registered()