diff --git a/src/Pecee/SimpleRouter/ClassLoader/ClassLoader.php b/src/Pecee/SimpleRouter/ClassLoader/ClassLoader.php
index c928339..40cb3b6 100644
--- a/src/Pecee/SimpleRouter/ClassLoader/ClassLoader.php
+++ b/src/Pecee/SimpleRouter/ClassLoader/ClassLoader.php
@@ -3,6 +3,7 @@
 namespace Pecee\SimpleRouter\ClassLoader;
 
 use DI\Container;
+use Pecee\SimpleRouter\Exceptions\ClassNotFoundHttpException;
 use Pecee\SimpleRouter\Exceptions\NotFoundHttpException;
 
 class ClassLoader implements IClassLoader
@@ -28,7 +29,7 @@ class ClassLoader implements IClassLoader
     public function loadClass(string $class)
     {
         if (class_exists($class) === false) {
-            throw new NotFoundHttpException(sprintf('Class "%s" does not exist', $class), 404);
+            throw new ClassNotFoundHttpException(sprintf('Class "%s" does not exist', $class), 404, null, $class);
         }
 
         if ($this->useDependencyInjection === true) {
diff --git a/src/Pecee/SimpleRouter/Exceptions/ClassNotFoundHttpException.php b/src/Pecee/SimpleRouter/Exceptions/ClassNotFoundHttpException.php
new file mode 100644
index 0000000..d283874
--- /dev/null
+++ b/src/Pecee/SimpleRouter/Exceptions/ClassNotFoundHttpException.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Pecee\SimpleRouter\Exceptions;
+
+use Throwable;
+
+class ClassNotFoundHttpException extends NotFoundHttpException
+{
+    protected $class;
+    protected $method;
+
+    public function __construct($message = "", $code = 0, Throwable $previous = null, string $class, ?string $method = null)
+    {
+        parent::__construct($message, $code, $previous);
+
+        $this->class = $class;
+        $this->method = $method;
+    }
+
+    /**
+     * Get class name
+     * @return string
+     */
+    public function getClass(): string
+    {
+        return $this->class;
+    }
+
+    /**
+     * Get method
+     * @return string|null
+     */
+    public function getMethod(): ?string
+    {
+        return $this->method;
+    }
+
+}
\ No newline at end of file
diff --git a/src/Pecee/SimpleRouter/Route/Route.php b/src/Pecee/SimpleRouter/Route/Route.php
index 3e9370c..574c412 100644
--- a/src/Pecee/SimpleRouter/Route/Route.php
+++ b/src/Pecee/SimpleRouter/Route/Route.php
@@ -4,6 +4,7 @@ namespace Pecee\SimpleRouter\Route;
 
 use Pecee\Http\Middleware\IMiddleware;
 use Pecee\Http\Request;
+use Pecee\SimpleRouter\Exceptions\ClassNotFoundHttpException;
 use Pecee\SimpleRouter\Exceptions\NotFoundHttpException;
 use Pecee\SimpleRouter\Router;
 
@@ -95,7 +96,7 @@ abstract class Route implements IRoute
         }
 
         if (method_exists($class, $method) === false) {
-            throw new NotFoundHttpException(sprintf('Method "%s" does not exist in class "%s"', $method, $className), 404);
+            throw new ClassNotFoundHttpException(sprintf('Method "%s" does not exist in class "%s"', $method, $className), 404, null, $className, $method);
         }
 
         $router->debug('Executing callback');
diff --git a/tests/Pecee/SimpleRouter/RouterUrlTest.php b/tests/Pecee/SimpleRouter/RouterUrlTest.php
index 2d67e49..b360973 100644
--- a/tests/Pecee/SimpleRouter/RouterUrlTest.php
+++ b/tests/Pecee/SimpleRouter/RouterUrlTest.php
@@ -11,7 +11,7 @@ class RouterUrlTest extends \PHPUnit\Framework\TestCase
     {
         TestRouter::get('/', 'DummyController@method1');
         TestRouter::get('/page/{id?}', 'DummyController@method1');
-        TestRouter::get('/test-output', function() {
+        TestRouter::get('/test-output', function () {
             return 'return value';
         });
 
@@ -175,7 +175,7 @@ class RouterUrlTest extends \PHPUnit\Framework\TestCase
     {
         TestRouter::request()->setHost('google.com');
 
-        TestRouter::get('/admin/', function() {
+        TestRouter::get('/admin/', function () {
             return 'match';
         })->setMatch('/^\/admin\/?(.*)/i');
 
@@ -185,24 +185,52 @@ class RouterUrlTest extends \PHPUnit\Framework\TestCase
 
     public function testDefaultNamespace()
     {
-        TestRouter::setDefaultNamespace('\\TestRoutersss');
+        TestRouter::setDefaultNamespace('\\Default\\Namespace');
 
         TestRouter::get('/', 'DummyController@method1', ['as' => 'home']);
-        TestRouter::get('/about', 'DummyController@about');
 
         TestRouter::group([
-            'prefix' => '/horses',
-        ], function() {
+            'namespace' => 'Appended\Namespace',
+            'prefix'    => '/horses',
+        ], function () {
 
-            TestRouter::get('/about', 'DummyController@about');
+            TestRouter::get('/', 'DummyController@method1');
 
+            TestRouter::group([
+                'namespace' => '\\New\\Namespace',
+                'prefix'    => '/race',
+            ], function () {
+
+                TestRouter::get('/', 'DummyController@method1');
+
+            });
         });
 
+        // Test appended namespace
 
-        TestRouter::debugNoReset('/horses/about');
+        $class = null;
 
+        try {
+            TestRouter::debugNoReset('/horses/');
+        } catch (\Pecee\SimpleRouter\Exceptions\ClassNotFoundHttpException $e) {
+            $class = $e->getClass();
+        }
 
-        $routes = TestRouter::router()->getRoutes();
+        $this->assertEquals('\\Default\\Namespace\\Appended\Namespace\\DummyController', $class);
+
+        // Test overwritten namespace
+
+        $class = null;
+
+        try {
+            TestRouter::debugNoReset('/horses/race');
+        } catch (\Pecee\SimpleRouter\Exceptions\ClassNotFoundHttpException $e) {
+            $class = $e->getClass();
+        }
+
+        $this->assertEquals('\\New\\Namespace\\DummyController', $class);
+
+        TestRouter::router()->reset();
     }
 
 }
\ No newline at end of file