diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index 678698f4d0747..4d494eed09e60 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -250,6 +250,7 @@ private function addFormSection(ArrayNodeDefinition $rootNode, callable $enableI
                                 ->scalarNode('field_name')->defaultValue('_token')->end()
                                 ->arrayNode('field_attr')
                                     ->performNoDeepMerging()
+                                    ->normalizeKeys(false)
                                     ->scalarPrototype()->end()
                                     ->defaultValue(['data-controller' => 'csrf-protection'])
                                 ->end()
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
index 53706d2e05e32..6f3363f3998a0 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
@@ -699,6 +699,22 @@ public function testSerializerJsonDetailedErrorMessagesNotSetByDefaultWithDebugD
         $this->assertSame([], $config['serializer']['default_context'] ?? []);
     }
 
+    public function testFormCsrfProtectionFieldAttrDoNotNormalizeKeys()
+    {
+        $processor = new Processor();
+        $config = $processor->processConfiguration(new Configuration(false), [
+            [
+                'form' => [
+                    'csrf_protection' => [
+                        'field_attr' => ['data-example-attr' => 'value'],
+                    ],
+                ],
+            ],
+        ]);
+
+        $this->assertSame(['data-example-attr' => 'value'], $config['form']['csrf_protection']['field_attr'] ?? []);
+    }
+
     protected static function getBundleDefaultConfig()
     {
         return [