diff --git a/omr-tracker/files/bin/omr-tracker-ss b/omr-tracker/files/bin/omr-tracker-ss
index 9895c5c87..c081a743e 100755
--- a/omr-tracker/files/bin/omr-tracker-ss
+++ b/omr-tracker/files/bin/omr-tracker-ss
@@ -8,15 +8,16 @@ log() {
 	logger -p daemon.info -t "${basename}" "$@"
 }
 
-timeout=$OMR_TRACKER_TIMEOUT
-interval=$OMR_TRACKER_INTERVAL
-retry=$OMR_TRACKER_TRIES
-proxy=$OMR_TRACKER_PROXY
+timeout=${OMR_TRACKER_TIMEOUT:-1}
+interval=${OMR_TRACKER_INTERVAL:-10}
+retry=${OMR_TRACKER_TRIES:-2}
+proxy=${OMR_TRACKER_PROXY:-127.0.0.1:1111}
+hosts=${OMR_TRACKER_HOSTS:-google.com bing.com}
 
 last=0
 
 while true; do
-	host=${OMR_TRACKER_HOSTS%% *}
+	host=${hosts%% *}
 	if curl -s --socks5 "${proxy}" --max-time "${timeout}" --retry "${retry}" "$host" &>/dev/null ; then
 		[ ${last} = 0 ] && log "Shadowsocks is up"
 		/etc/init.d/shadowsocks-libev rules_up 2> /dev/null