diff --git a/docker-compose.yml b/docker-compose.yml
index 69b5dc6..9e6bce9 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -183,6 +183,7 @@ services:
           - INSTALL_MYSQL_CLIENT=${PHP_FPM_INSTALL_MYSQL_CLIENT}
           - INSTALL_PING=${PHP_FPM_INSTALL_PING}
           - INSTALL_SSHPASS=${PHP_FPM_INSTALL_SSHPASS}
+          - INSTALL_PCNTL=${PHP_FPM_INSTALL_PCNTL}
           - ADDITIONAL_LOCALES=${PHP_FPM_ADDITIONAL_LOCALES}
           - INSTALL_FFMPEG=${PHP_FPM_FFMPEG}
           - http_proxy