diff --git a/src/Menu.php b/src/Menu.php
index 5d32bfb..f89a039 100644
--- a/src/Menu.php
+++ b/src/Menu.php
@@ -28,10 +28,10 @@ abstract class Menu
 	 */
     public function __construct(BaseMenu $builder = null)
     {
-		$this->builder = $builder ?? BaseMenu::new()->setActive(
-			current_url(),
-			(new URI(base_url()))->getPath() ?? '/'
-		);
+		$current = $this->detectCurrent();
+		$root    = (new URI(site_url()))->getPath() ?? '/';
+
+		$this->builder = $builder ?? BaseMenu::new()->setActive($current, $root);
 
 		foreach (class_uses_recursive($this) as $trait)
 		{
@@ -59,4 +59,40 @@ public function builder(): BaseMenu
 	 * @return string
 	 */
 	abstract public function __toString(): string;
+
+	/**
+	 * Returns the current URL to use for determining
+	 * which menu items should be active.
+	 * Due to this bug:
+	 * - https://github.com/codeigniter4/CodeIgniter4/issues/4116
+	 * ...we cannot use current_url(). This method can be
+	 * replaced if that bug is fixed or if we get this:
+	 * - https://github.com/codeigniter4/CodeIgniter4/pull/4647
+	 *
+	 * @return string
+	 * @internal
+	 */
+	protected function detectCurrent(): string
+    {
+		// Force path discovery in a new IncomingRequest
+		$request = service('request', null, false);
+		$path    = ltrim($request->detectPath($request->config->uriProtocol), '/');
+
+		// Build the full URL based on the config and path
+		$url = rtrim($request->config->baseURL, '/ ') . '/';
+
+		// Check for an index page
+		if ($request->config->indexPage !== '')
+		{
+			$url .= $request->config->indexPage;
+
+			// If there is a path then we need a separator
+			if ($path !== '')
+			{
+				$url .= '/';
+			}
+		}
+
+		return (string) (new URI($url . $path));
+	}
 }
diff --git a/tests/_support/MenusTestCase.php b/tests/_support/MenusTestCase.php
index 1dfcaa5..f60c473 100644
--- a/tests/_support/MenusTestCase.php
+++ b/tests/_support/MenusTestCase.php
@@ -32,9 +32,8 @@ protected function setUp(): void
 		Factories::injectMock('config', 'App', $config);
 
 		// Set a current URL for checking "active" links
-		$request      = Services::request();
-		$request->uri = new URI(site_url('current'));
-		Services::injectMock('request', $request);
+		$_SERVER['REQUEST_URI'] = '/current';
+		Services::injectMock('request', null);
 
 		// Create some Menu aliases for testing
 		$config          = new MenusConfig();
diff --git a/tests/menu/MenuTest.php b/tests/menu/MenuTest.php
index 042c8bd..cb3cc7b 100644
--- a/tests/menu/MenuTest.php
+++ b/tests/menu/MenuTest.php
@@ -1,5 +1,6 @@
 <?php namespace Tests\Support;
 
+use Config\Services;
 use Spatie\Menu\Menu as BaseMenu;
 use Tatter\Menus\Menu;
 use Tests\Support\MenusTestCase;
@@ -7,23 +8,18 @@
 class MenuTest extends MenusTestCase
 {
 	/**
-	 * @var Menu
+	 * Generates a test Menu on-the-fly
+	 *
+	 * @return Menu
 	 */
-	private $menu;
-
-	/**
-	 * Creates a basic Menu to use for testing.
-	 */
-	protected function setUp(): void
+	private function menu(): Menu
 	{
-		parent::setUp();
-
-		$this->menu = new class extends Menu {
+		return new class extends Menu {
 
 			public function __toString(): string
 			{
 				return $this->builder
-					->link(site_url('/'), 'Home')
+					->link(site_url(''), 'Home')
 					->link(site_url('/current'), 'Grain')
 					->render();
 			}
@@ -32,7 +28,7 @@ public function __toString(): string
 
 	public function testGetBuilder()
 	{
-		$result = $this->menu->builder();
+		$result = $this->menu()->builder();
 
 		$this->assertInstanceOf(BaseMenu::class, $result);
 	}
@@ -55,7 +51,19 @@ public function __toString(): string
 	public function testGetUsesCurrentUrl()
 	{
 		$expected = '<ul><li><a href="http://example.com/">Home</a></li><li class="active exact-active"><a href="http://example.com/current">Grain</a></li></ul>';
-		$result   = $this->menu->__toString();
+		$result   = $this->menu()->__toString();
+
+		$this->assertSame($expected, $result);
+	}
+
+	public function testGetUsesIndexPage()
+	{
+		$config = config('App');
+		$config->indexPage = 'index.php';
+		Services::injectMock('request', null);
+
+		$expected = '<ul><li><a href="http://example.com/index.php">Home</a></li><li class="active exact-active"><a href="http://example.com/index.php/current">Grain</a></li></ul>';
+		$result   = $this->menu()->__toString();
 
 		$this->assertSame($expected, $result);
 	}