diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index d23bdbc480..58148b18ca 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -1122,6 +1122,8 @@ class Configuration implements ConfigurationInterface
                     ->fixXmlConfig('resource')
                     ->children()
                         ->arrayNode('resources')
+                            ->normalizeKeys(false)
+                            ->useAttributeAsKey('name')
                             ->requiresAtLeastOneElement()
                             ->defaultValue(['default' => [class_exists(SemaphoreStore::class) && SemaphoreStore::isSupported() ? 'semaphore' : 'flock']])
                             ->beforeNormalization()
@@ -1144,6 +1146,7 @@ class Configuration implements ConfigurationInterface
                                 })
                             ->end()
                             ->prototype('array')
+                                ->performNoDeepMerging()
                                 ->beforeNormalization()->ifString()->then(function ($v) { return [$v]; })->end()
                                 ->prototype('scalar')->end()
                             ->end()
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
index aff4e5ea41..e19ed2964c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
@@ -250,6 +250,34 @@ class ConfigurationTest extends TestCase
         yield [['enabled' => false, 'resource' => [['name' => 'foo', 'value' => 'flock'], ['name' => 'foo', 'value' => 'semaphore'], ['name' => 'bar', 'value' => 'semaphore']]], ['enabled' => false, 'resources' => ['foo' => ['flock', 'semaphore'], 'bar' => ['semaphore']]]];
     }
 
+    public function testLockMergeConfigs()
+    {
+        $processor = new Processor();
+        $configuration = new Configuration(true);
+        $config = $processor->processConfiguration($configuration, [
+            [
+                'lock' => [
+                    'payload' => 'flock',
+                ],
+            ],
+            [
+                'lock' => [
+                    'payload' => 'semaphore'
+                ],
+            ],
+        ]);
+
+        $this->assertEquals(
+            [
+                'enabled' => true,
+                'resources' => [
+                    'payload' => ['semaphore']
+                ],
+            ],
+            $config['lock']
+        );
+    }
+
     public function testItShowANiceMessageIfTwoMessengerBusesAreConfiguredButNoDefaultBus()
     {
         $expectedMessage = 'You must specify the "default_bus" if you define more than one bus.';