diff --git a/composer.json b/composer.json
index 75120950..9db2f5c7 100644
--- a/composer.json
+++ b/composer.json
@@ -27,6 +27,9 @@
         "ext-json": "*"
     },
     "autoload": {
+        "files": [
+            "flight/autoload.php"
+        ],
         "classmap": [
             "flight/Flight.php"
         ],
diff --git a/flight/autoload.php b/flight/autoload.php
index e4017284..9ae0c69d 100644
--- a/flight/autoload.php
+++ b/flight/autoload.php
@@ -8,7 +8,8 @@
 require_once __DIR__ . '/core/Loader.php';
 
 if (file_exists(__DIR__ . '/../vendor/autoload.php')) {
-    return require_once __DIR__ . '/../vendor/autoload.php';
+    require_once __DIR__ . '/../vendor/autoload.php';
+    Loader::autoload(true);
+} else {
+    Loader::autoload(true, [dirname(__DIR__)]);
 }
-
-Loader::autoload(true, dirname(__DIR__));
diff --git a/tests/AutoloadTest.php b/tests/AutoloadTest.php
index 97ee31aa..a6ad8631 100644
--- a/tests/AutoloadTest.php
+++ b/tests/AutoloadTest.php
@@ -4,9 +4,12 @@
 
 namespace tests;
 
+use Flight;
+use flight\core\Loader;
 use flight\Engine;
 use tests\classes\User;
 use PHPUnit\Framework\TestCase;
+use ReflectionClass;
 
 class AutoloadTest extends TestCase
 {
@@ -18,6 +21,17 @@ protected function setUp(): void
         $this->app->path(__DIR__ . '/classes');
     }
 
+    protected function tearDown(): void
+    {
+        $dirsProperty = (new ReflectionClass(Loader::class))->getProperty('dirs');
+
+        if (PHP_VERSION_ID < 80100) {
+            $dirsProperty->setAccessible(true);
+        }
+
+        $dirsProperty->setValue(null, []);
+    }
+
     // Autoload a class
     public function testAutoload(): void
     {
@@ -44,4 +58,17 @@ public function testMissingClass(): void
 
         self::assertNull($test);
     }
+
+    // Flight::path() must load namespaced classes that Composer PSR-4 does not map
+    public function testPathAutoloadsNamespacedClassOutsideComposerPsr4(): void
+    {
+        $class = \app\middleware\Something::class;
+
+        self::assertFalse(class_exists($class));
+
+        Flight::path(__DIR__ . '/path_autoload_fixtures');
+
+        self::assertTrue(class_exists($class));
+        self::assertTrue(class_exists(Engine::class));
+    }
 }
diff --git a/tests/path_autoload_fixtures/app/middleware/Something.php b/tests/path_autoload_fixtures/app/middleware/Something.php
new file mode 100644
index 00000000..67675bb8
--- /dev/null
+++ b/tests/path_autoload_fixtures/app/middleware/Something.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace app\middleware;
+
+class Something
+{
+}