diff --git a/src/Symfony/Component/Messenger/composer.json b/src/Symfony/Component/Messenger/composer.json
index 25b91b42cba16..73e00070d3f46 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|^7.0"
     },