diff --git a/Util/ControllerReflector.php b/Util/ControllerReflector.php
index 568da23..7eba46e 100644
--- a/Util/ControllerReflector.php
+++ b/Util/ControllerReflector.php
@@ -13,6 +13,7 @@ namespace Nelmio\ApiDocBundle\Util;
 
 use Symfony\Bundle\FrameworkBundle\Controller\ControllerNameParser;
 use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpKernel\Kernel;
 
 /**
  * @internal
@@ -85,10 +86,20 @@ class ControllerReflector
         if (preg_match('#(.+)::([\w]+)#', $controller, $matches)) {
             $class = $matches[1];
             $method = $matches[2];
+            // Since symfony 4.1 routes are defined like service_id::method_name
+            if (Kernel::VERSION_ID >= 40100 && !class_exists($class)) {
+                if ($this->container->has($class)) {
+                    $class = get_class($this->container->get($class));
+                    if (class_exists(ClassUtils::class)) {
+                        $class = ClassUtils::getRealClass($class);
+                    }
+                }
+            }
         } elseif (class_exists($controller)) {
             $class = $controller;
             $method = '__invoke';
         } else {
+            // Has to be removed when dropping support of symfony < 4.1
             if (preg_match('#(.+):([\w]+)#', $controller, $matches)) {
                 $controller = $matches[1];
                 $method = $matches[2];