diff --git a/src/ol/pointer/touchsource.js b/src/ol/pointer/touchsource.js
index e4113f1c99..f3a6907d1d 100644
--- a/src/ol/pointer/touchsource.js
+++ b/src/ol/pointer/touchsource.js
@@ -72,12 +72,6 @@ ol.pointer.TouchSource = function(dispatcher, mouseSource) {
    */
   this.CLICK_COUNT_TIMEOUT = 200;
 
-  /**
-   * @const
-   * @type {string}
-   */
-  this.POINTER_TYPE = 'touch';
-
   /**
    * @private
    * @type {?number}
@@ -110,6 +104,13 @@ ol.pointer.TouchSource = function(dispatcher, mouseSource) {
 goog.inherits(ol.pointer.TouchSource, ol.pointer.EventSource);
 
 
+/**
+ * @const
+ * @type {string}
+ */
+ol.pointer.TouchSource.POINTER_TYPE = 'touch';
+
+
 /** @inheritDoc */
 ol.pointer.TouchSource.prototype.getEvents = function() {
   return goog.object.getKeys(this.mapping);
@@ -207,7 +208,7 @@ ol.pointer.TouchSource.prototype.touchToPointer_ =
   e.height = inTouch['webkitRadiusY'] || inTouch['radiusY'] || 0;
   e.pressure = inTouch['webkitForce'] || inTouch['force'] || 0.5;
   e.isPrimary = this.isPrimaryTouch_(inTouch);
-  e.pointerType = this.POINTER_TYPE;
+  e.pointerType = ol.pointer.TouchSource.POINTER_TYPE;
 
   // make sure that the properties that are different for
   // each `Touch` object are not copied from the BrowserEvent object