diff -up dovecot-2.2.22/dovecot.service.in.waitonline dovecot-2.2.22/dovecot.service.in
--- dovecot-2.2.22/dovecot.service.in.waitonline	2016-03-16 13:36:49.426772606 +0100
+++ dovecot-2.2.22/dovecot.service.in	2016-03-16 13:47:23.923606903 +0100
@@ -24,6 +24,7 @@ After=local-fs.target network.target
 
 [Service]
 Type=forking
+ExecStartPre=/usr/libexec/dovecot/prestartscript
 ExecStart=@sbindir@/dovecot
 PIDFile=@rundir@/master.pid
 ExecReload=@bindir@/doveadm reload