diff --git a/group_vars/zabbix-server.yml b/group_vars/zabbix-server.yml
index d94160c..1b692b0 100644
--- a/group_vars/zabbix-server.yml
+++ b/group_vars/zabbix-server.yml
@@ -1,3 +1,4 @@
+apache_mpm: prefork
 pg_hba_extra:
 - type: local
   database: zabbix