diff --git a/src/Symfony/Bundle/SecurityBundle/SecurityUserValueResolver.php b/src/Symfony/Bundle/SecurityBundle/SecurityUserValueResolver.php
index 476e24ee4e456..b8a2454f96be1 100644
--- a/src/Symfony/Bundle/SecurityBundle/SecurityUserValueResolver.php
+++ b/src/Symfony/Bundle/SecurityBundle/SecurityUserValueResolver.php
@@ -40,7 +40,7 @@ public function __construct(TokenStorageInterface $tokenStorage)
     public function supports(Request $request, ArgumentMetadata $argument)
     {
         // only security user implementations are supported
-        if (UserInterface::class !== $argument->getType()) {
+        if (!$argument->getType() || !$this->implementsCorrectInterface($argument->getType())) {
             return false;
         }
 
@@ -59,4 +59,14 @@ public function resolve(Request $request, ArgumentMetadata $argument)
     {
         yield $this->tokenStorage->getToken()->getUser();
     }
+
+    /**
+     * @param string $type
+     *
+     * @return bool
+     */
+    private function implementsCorrectInterface($type)
+    {
+        return UserInterface::class === $type || array_key_exists(UserInterface::class, class_implements($type));
+    }
 }
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/SecurityUserValueResolverTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/SecurityUserValueResolverTest.php
index a8f005b2e4318..53e20b187f4fc 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/SecurityUserValueResolverTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/SecurityUserValueResolverTest.php
@@ -72,6 +72,21 @@ public function testResolve()
         $this->assertSame(array($user), iterator_to_array($resolver->resolve(Request::create('/'), $metadata)));
     }
 
+    public function testResolveUserInterfaceImplementation()
+    {
+        $user = $this->getMockBuilder(UserInterface::class)->getMock();
+        $token = $this->getMockBuilder(TokenInterface::class)->getMock();
+        $token->expects($this->any())->method('getUser')->willReturn($user);
+        $tokenStorage = new TokenStorage();
+        $tokenStorage->setToken($token);
+
+        $resolver = new SecurityUserValueResolver($tokenStorage);
+        $metadata = new ArgumentMetadata('foo', DummySubUser::class, false, false, null);
+
+        $this->assertTrue($resolver->supports(Request::create('/'), $metadata));
+        $this->assertSame(array($user), iterator_to_array($resolver->resolve(Request::create('/'), $metadata)));
+    }
+
     public function testIntegration()
     {
         $user = $this->getMockBuilder(UserInterface::class)->getMock();
diff --git a/src/Symfony/Component/Security/Http/Controller/UserValueResolver.php b/src/Symfony/Component/Security/Http/Controller/UserValueResolver.php
index 221d8d8eada5c..01f83a59daefb 100644
--- a/src/Symfony/Component/Security/Http/Controller/UserValueResolver.php
+++ b/src/Symfony/Component/Security/Http/Controller/UserValueResolver.php
@@ -35,7 +35,7 @@ public function __construct(TokenStorageInterface $tokenStorage)
     public function supports(Request $request, ArgumentMetadata $argument)
     {
         // only security user implementations are supported
-        if (UserInterface::class !== $argument->getType()) {
+        if (!$argument->getType() || !$this->implementsCorrectInterface($argument->getType())) {
             return false;
         }
 
@@ -54,4 +54,14 @@ public function resolve(Request $request, ArgumentMetadata $argument)
     {
         yield $this->tokenStorage->getToken()->getUser();
     }
+
+    /**
+     * @param string $type
+     *
+     * @return bool
+     */
+    private function implementsCorrectInterface($type)
+    {
+        return UserInterface::class === $type || array_key_exists(UserInterface::class, class_implements($type));
+    }
 }
diff --git a/src/Symfony/Component/Security/Http/Tests/Controller/UserValueResolverTest.php b/src/Symfony/Component/Security/Http/Tests/Controller/UserValueResolverTest.php
index 62f4c1262120c..20c31098226b9 100644
--- a/src/Symfony/Component/Security/Http/Tests/Controller/UserValueResolverTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Controller/UserValueResolverTest.php
@@ -69,6 +69,21 @@ public function testResolve()
         $this->assertSame(array($user), iterator_to_array($resolver->resolve(Request::create('/'), $metadata)));
     }
 
+    public function testResolveUserInterfaceImplementation()
+    {
+        $user = $this->getMockBuilder(UserInterface::class)->getMock();
+        $token = $this->getMockBuilder(TokenInterface::class)->getMock();
+        $token->expects($this->any())->method('getUser')->willReturn($user);
+        $tokenStorage = new TokenStorage();
+        $tokenStorage->setToken($token);
+
+        $resolver = new UserValueResolver($tokenStorage);
+        $metadata = new ArgumentMetadata('foo', DummySubUser::class, false, false, null);
+
+        $this->assertTrue($resolver->supports(Request::create('/'), $metadata));
+        $this->assertSame(array($user), iterator_to_array($resolver->resolve(Request::create('/'), $metadata)));
+    }
+
     public function testIntegration()
     {
         $user = $this->getMockBuilder(UserInterface::class)->getMock();

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