diff --git a/upstart/alprd.conf b/upstart/alprd.conf
index 265fd8e..a9a2dcf 100644
--- a/upstart/alprd.conf
+++ b/upstart/alprd.conf
@@ -17,7 +17,7 @@ env uid=watchtower
 env gid=watchtower
 
 env DAEMON=/usr/local/bin/alprd
-env DAEMON_ARGS="-l /var/log/watchtower/alprd.log"
+env DAEMON_ARGS="-l /var/log/watchtower/alprd.log -n 20"
 env PIDFILE=/var/run/alprd.pid
 
 exec start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON --chuid $uid:$gid -- $DAEMON_ARGS