diff --git a/Describer/SwaggerPhpDescriber.php b/Describer/SwaggerPhpDescriber.php
index a850273..f011e32 100644
--- a/Describer/SwaggerPhpDescriber.php
+++ b/Describer/SwaggerPhpDescriber.php
@@ -123,7 +123,7 @@ final class SwaggerPhpDescriber implements ModelRegistryAwareInterface
                 return $v instanceof SWG\AbstractAnnotation;
             });
 
-            if (0 === count($annotations)) {
+            if (0 === count($annotations) && 0 === count($classAnnotations[$declaringClass->getName()])) {
                 continue;
             }
 
diff --git a/Tests/Functional/Controller/InvokableController.php b/Tests/Functional/Controller/InvokableController.php
new file mode 100644
index 0000000..5640aa6
--- /dev/null
+++ b/Tests/Functional/Controller/InvokableController.php
@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of the NelmioApiDocBundle package.
+ *
+ * (c) Nelmio
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Nelmio\ApiDocBundle\Tests\Functional\Controller;
+
+use Swagger\Annotations as SWG;
+use Symfony\Component\Routing\Annotation\Route;
+
+/**
+ * Prevents a regression (see https://github.com/nelmio/NelmioApiDocBundle/issues/1559).
+ *
+ * @Route("/api/invoke", host="api.example.com", name="invokable", methods={"GET"})
+ * @SWG\Response(
+ *    response=200,
+ *    description="Invokable!"
+ * )
+ */
+class InvokableController
+{
+    public function __invoke()
+    {
+    }
+}
diff --git a/Tests/Functional/FunctionalTest.php b/Tests/Functional/FunctionalTest.php
index 7d2db9a..8291c50 100644
--- a/Tests/Functional/FunctionalTest.php
+++ b/Tests/Functional/FunctionalTest.php
@@ -423,4 +423,10 @@ class FunctionalTest extends WebTestCase
         $this->assertFalse($modelProperties->has('bar'));
         $this->assertTrue($modelProperties->has('notwhatyouthink'));
     }
+
+    public function testInvokableController()
+    {
+        $operation = $this->getOperation('/api/invoke', 'get');
+        $this->assertSame('Invokable!', $operation->getResponses()->get(200)->getDescription());
+    }
 }
diff --git a/Tests/Functional/TestKernel.php b/Tests/Functional/TestKernel.php
index d709ac5..32e9399 100644
--- a/Tests/Functional/TestKernel.php
+++ b/Tests/Functional/TestKernel.php
@@ -81,6 +81,7 @@ class TestKernel extends Kernel
         $routes->import(__DIR__.'/Controller/ApiController.php', '/', 'annotation');
         $routes->import(__DIR__.'/Controller/ClassApiController.php', '/', 'annotation');
         $routes->import(__DIR__.'/Controller/UndocumentedController.php', '/', 'annotation');
+        $routes->import(__DIR__.'/Controller/InvokableController.php', '/', 'annotation');
         $routes->import('', '/api', 'api_platform');
         $routes->add('/docs/{area}', 'nelmio_api_doc.controller.swagger_ui')->setDefault('area', 'default');
         $routes->add('/docs.json', 'nelmio_api_doc.controller.swagger');
diff --git a/composer.json b/composer.json
index 393d2cd..3a77a8c 100644
--- a/composer.json
+++ b/composer.json
@@ -37,7 +37,7 @@
         "symfony/cache": "^3.4|^4.0|^5.0",
         "symfony/phpunit-bridge": "^3.4.24|^4.0|^5.0",
         "symfony/stopwatch": "^3.4|^4.0|^5.0",
-        "symfony/routing": "^3.4|^4.0|^5.0",
+        "symfony/routing": "^3.4.42|^4.0|^5.0",
         "sensio/framework-extra-bundle": "^3.0.13|^4.0|^5.0",
         "doctrine/annotations": "^1.2",
         "doctrine/common": "^2.4",