diff -dur -x '*~' syslog-ng-syslog-ng-3.14.1.orig/contrib/systemd/syslog-ng@.service syslog-ng-syslog-ng-3.14.1/contrib/systemd/syslog-ng@.service
--- syslog-ng-syslog-ng-3.14.1.orig/contrib/systemd/syslog-ng@.service	2018-02-26 15:32:28.000000000 +0100
+++ syslog-ng-syslog-ng-3.14.1/contrib/systemd/syslog-ng@.service	2018-03-30 15:38:31.000000000 +0200
@@ -5,13 +5,17 @@
 
 [Service]
 Type=notify
+Environment=CONFIG_FILE=/etc/syslog-ng/syslog-ng.conf
+Environment=PID_FILE=/var/run/syslogd.pid
+Environment=PERSIST_FILE=/var/lib/syslog-ng/syslog-ng.persist
+Environment=CONTROL_FILE=/var/lib/syslog-ng/syslog-ng.ctl
 EnvironmentFile=-/etc/default/syslog-ng@%i
 EnvironmentFile=-/etc/sysconfig/syslog-ng@%i
-ExecStart=/usr/sbin/syslog-ng -F $OTHER_OPTIONS --cfgfile $CONFIG_FILE --control $CONTROL_FILE --persist-file $PERSIST_FILE --pidfile $PID_FILE
+ExecStart=/sbin/syslog-ng -F $OTHER_OPTIONS --cfgfile $CONFIG_FILE --control $CONTROL_FILE --persist-file $PERSIST_FILE --pidfile $PID_FILE $SYSLOGNG_OPTS
 ExecReload=/bin/kill -HUP $MAINPID
 StandardOutput=journal
 StandardError=journal
 Restart=on-failure
 
 [Install]
+DefaultInstance=default
-WantedBy=multi-user.target