diff --git a/contrib/systemd/haproxy.service.in b/contrib/systemd/haproxy.service.in
index 1387012..44c369c 100644
--- a/contrib/systemd/haproxy.service.in
+++ b/contrib/systemd/haproxy.service.in
@@ -4,7 +4,7 @@
 
 [Service]
 EnvironmentFile=-/etc/default/haproxy
-Environment="CONFIG=/etc/haproxy/haproxy.cfg" "PIDFILE=/run/haproxy.pid"
+Environment="CONFIG=/etc/haproxy/haproxy.cfg" "PIDFILE=/run/haproxy.pid" "EXTRAOPTS=-S /run/haproxy-master.sock"
 ExecStartPre=@SBINDIR@/haproxy -f $CONFIG -c -q $EXTRAOPTS
 ExecStart=@SBINDIR@/haproxy -Ws -f $CONFIG -p $PIDFILE $EXTRAOPTS
 ExecReload=@SBINDIR@/haproxy -f $CONFIG -c -q $EXTRAOPTS