diff --git a/calendar/locales/en-US/chrome/calendar/calendar.properties b/calendar/locales/en-US/chrome/calendar/calendar.properties
index 56594a74dc88..a9535785af4d 100644
--- a/calendar/locales/en-US/chrome/calendar/calendar.properties
+++ b/calendar/locales/en-US/chrome/calendar/calendar.properties
@@ -109,6 +109,7 @@ defaultPreviousWeeksInView=0
 showAlarms=1
 showMissed=1
 playAlarmSound=0
+soundURL = chrome://content/calendar/sound.wav
 reloadServersOnLaunch=false
 defaultEventLength=60
 defaultSnoozeAlarmLength=60