diff --git a/.env.sample b/.env.sample
index 40f038f..f7598c3 100644
--- a/.env.sample
+++ b/.env.sample
@@ -19,6 +19,7 @@ SECRET_ADMIN_PASSWORD_VERSION=v1
 
 EXTRA_VOLUME=/dev/null:/tmp/.dummy
 
+PHP_MEMORY_LIMIT=1G
 # fpm-tune, see: https://spot13.com/pmcalculator/
 FPM_MAX_CHILDREN=131
 FPM_START_SERVERS=32
diff --git a/compose.yml b/compose.yml
index b9b807f..61db26b 100644
--- a/compose.yml
+++ b/compose.yml
@@ -67,11 +67,11 @@ services:
       - TRUSTED_PROXIES=10.0.0.0/8
       - REDIS_HOST=cache
       - OVERWRITEPROTOCOL=https
-      - PHP_MEMORY_LIMIT=1G
-      - FPM_MAX_CHILDREN=131
-      - FPM_START_SERVERS=32
-      - FPM_MIN_SPARE_SERVERS=32
-      - FPM_MAX_SPARE_SERVERS=98
+      - PHP_MEMORY_LIMIT=${PHP_MEMORY_LIMIT:-1G}
+      - FPM_MAX_CHILDREN=${FPM_MAX_CHILDREN:-131}
+      - FPM_START_SERVERS=${FPM_START_SERVERS:-32}
+      - FPM_MIN_SPARE_SERVERS=${FPM_MIN_SPARE_SERVERS:-32}
+      - FPM_MAX_SPARE_SERVERS=${FPM_MAX_SPARE_SERVERS:-98}
       - DEFAULT_QUOTA
     volumes:
       - nextcloud:/var/www/html/