diff --git a/app/views/conference/_venue_map.html.haml b/app/views/conference/_venue_map.html.haml
index 491ae4ae..b58b3053 100644
--- a/app/views/conference/_venue_map.html.haml
+++ b/app/views/conference/_venue_map.html.haml
@@ -5,7 +5,7 @@
     // create a map in the "map" div, set the view to a given place and zoom
     var map = L.map('map', { scrollWheelZoom: false }).setView([#{@conference.venue.latitude}, #{@conference.venue.longitude}], 11);
     // add an OpenStreetMap tile layer
-    L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
+    L.tileLayer('//{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
       attribution: 'Map data &copy; <a href="http://openstreetmap.org">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery © <a href="http://mapbox.com">Mapbox</a>',
       maxZoom: 18
     }).addTo(map);