diff --git a/src/objectliterals.jsdoc b/src/objectliterals.jsdoc
index ade707fd70..e26100a3b2 100644
--- a/src/objectliterals.jsdoc
+++ b/src/objectliterals.jsdoc
@@ -697,7 +697,7 @@
  *     function to load a tile given a URL.
  * @property {string|undefined} url URL template. Must include `{x}`, `{y}`,
  *     and `{z}` placeholders. Default is
- *     `http://{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png`.
+ *     `//{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png`.
  * @todo stability experimental
  */
 
diff --git a/src/ol/source/osmsource.js b/src/ol/source/osmsource.js
index 84175b5666..4fe96661d3 100644
--- a/src/ol/source/osmsource.js
+++ b/src/ol/source/osmsource.js
@@ -26,7 +26,7 @@ ol.source.OSM = function(opt_options) {
       options.crossOrigin : 'anonymous';
 
   var url = goog.isDef(options.url) ?
-      options.url : 'http://{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png';
+      options.url : '//{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png';
 
   goog.base(this, {
     attributions: attributions,