diff --git a/php/fpm/Dockerfile b/php/fpm/Dockerfile
index 564ff25..d6d257a 100644
--- a/php/fpm/Dockerfile
+++ b/php/fpm/Dockerfile
@@ -18,6 +18,7 @@ USER skpr
 # Configuration which can be overriden.
 # See /etc/php/php-fpm.conf
 ENV PHP_FPM_PORT=9000 \
+    PHP_FPM_PROCESS_MANAGER=dynamic \
     PHP_FPM_MAX_CHILDREN=20 \
     PHP_FPM_START_SERVERS=2 \
     PHP_FPM_MIN_SPARE_SERVERS=2 \
diff --git a/php/fpm/php-fpm.conf b/php/fpm/php-fpm.conf
index 79c31a3..68aadd2 100644
--- a/php/fpm/php-fpm.conf
+++ b/php/fpm/php-fpm.conf
@@ -6,7 +6,7 @@ listen = [::]:${PHP_FPM_PORT}
 
 chdir = /data/app
 
-pm = dynamic
+pm                   = ${PHP_FPM_PROCESS_MANAGER}
 pm.max_children      = ${PHP_FPM_MAX_CHILDREN}
 pm.start_servers     = ${PHP_FPM_START_SERVERS}
 pm.min_spare_servers = ${PHP_FPM_MIN_SPARE_SERVERS}