diff --git a/doc/docker/fpm/entrypoint.sh b/doc/docker/fpm/entrypoint.sh
index 9e1c6b5486..71e5c4e492 100755
--- a/doc/docker/fpm/entrypoint.sh
+++ b/doc/docker/fpm/entrypoint.sh
@@ -1,6 +1,11 @@
 #!/bin/bash
 set -e
 
+# if EGW_SESSION_TIMEOUT is set in environment, propagate value to php.ini
+test -n "$EGW_SESSION_TIMEOUT" && test "$EGW_SESSION_TIMEOUT" -ge 1440 &&
+	sed -e "s/^;\?session.gc_maxlifetime.*/session.gc_maxlifetime = $EGW_SESSION_TIMEOUT/g" \
+		-i /etc/php/7.3/fpm/php.ini
+
 # ToDo check version before copy
 rsync -a --delete /usr/share/egroupware-sources/ /usr/share/egroupware/