diff --git a/src/program/templates/schedule_overview.html b/src/program/templates/schedule_overview.html
index 1742ef78..3391ab54 100644
--- a/src/program/templates/schedule_overview.html
+++ b/src/program/templates/schedule_overview.html
@@ -30,13 +30,14 @@
 
 <script>
 var container = document.getElementById('schedule-container');
+var ws_scheme = window.location.protocol == "https:" ? "wss" : "ws";
 var elm_app = Elm.Main.embed(
     container,
     { 'schedule_timeslot_length_minutes': Number('{{ schedule_timeslot_length_minutes }}')
     , 'schedule_midnight_offset_hours': Number('{{ schedule_midnight_offset_hours }}')
     , 'ics_button_href': "{% url 'program:ics_view' camp_slug=camp.slug %}"
     , 'camp_slug': "{{ camp.slug }}"
-    , 'websocket_server': "wss://" + window.location.host + "/schedule/"
+    , 'websocket_server': ws_scheme + "://" + window.location.host + "/schedule/"
     }
 );
 </script>