diff --git a/src/Symfony/Component/DependencyInjection/Attribute/When.php b/src/Symfony/Component/DependencyInjection/Attribute/When.php
index 3114115fd22ef..60b7af04b6e21 100644
--- a/src/Symfony/Component/DependencyInjection/Attribute/When.php
+++ b/src/Symfony/Component/DependencyInjection/Attribute/When.php
@@ -16,7 +16,7 @@
  *
  * @author Nicolas Grekas <p@tchwork.com>
  */
-#[\Attribute(\Attribute::TARGET_CLASS | \Attribute::TARGET_METHOD | \Attribute::IS_REPEATABLE)]
+#[\Attribute(\Attribute::TARGET_CLASS | \Attribute::TARGET_METHOD | \Attribute::TARGET_FUNCTION | \Attribute::IS_REPEATABLE)]
 class When
 {
     public function __construct(