diff --git a/src/Symfony/Component/Messenger/composer.json b/src/Symfony/Component/Messenger/composer.json
index 7bbb47c4d26bf..1c97b37785af5 100644
--- a/src/Symfony/Component/Messenger/composer.json
+++ b/src/Symfony/Component/Messenger/composer.json
@@ -17,6 +17,7 @@
     ],
     "require": {
         "php": ">=8.1",
+        "ext-pcntl": "*",
         "psr/log": "^1|^2|^3",
         "symfony/clock": "^6.3",
         "symfony/deprecation-contracts": "^2.5|^3"