diff --git a/apps/sched/lib.js b/apps/sched/lib.js
index 1189fa275..48094c86f 100644
--- a/apps/sched/lib.js
+++ b/apps/sched/lib.js
@@ -38,7 +38,7 @@ exports.getTimeToAlarm = function(alarm, time) {
   if (!alarm) return undefined;
   if (!time) time = new Date();
   var currentTime = (time.getHours()*3600000)+(time.getMinutes()*60000)+(time.getSeconds()*1000);
-  var active = alarm.on && (alarm.dow>>(time.getDay()+(alarm.t<currentTime)))&1 && (!alarm.date || alarm.date==time.toISOString().substr(0,10));
+  var active = alarm.on && (alarm.dow>>((time.getDay()+(alarm.t<currentTime))%7))&1 && (!alarm.date || alarm.date==time.toISOString().substr(0,10));
   if (!active) return undefined;
   var t = alarm.t-currentTime;
   if (alarm.last == time.getDate() || t < -60000) t += 86400000;