diff --git a/.docker/php/Dockerfile b/.docker/php/Dockerfile
index cb2aa131..043f99b1 100644
--- a/.docker/php/Dockerfile
+++ b/.docker/php/Dockerfile
@@ -29,6 +29,9 @@ RUN pecl install redis && docker-php-ext-enable redis
 # pcov
 RUN pecl install pcov && docker-php-ext-enable pcov
 
+# pcntl
+RUN docker-php-ext-install pcntl
+
 # Xdebug
 # RUN pecl install xdebug \
 # && docker-php-ext-enable xdebug \