diff --git a/src/ol/interaction/touchinteraction.js b/src/ol/interaction/touchinteraction.js
index c71d5997de..1e96fe7ecb 100644
--- a/src/ol/interaction/touchinteraction.js
+++ b/src/ol/interaction/touchinteraction.js
@@ -31,6 +31,7 @@ ol.interaction.Touch = function() {
 
   /**
    * @type {Array.<Object>}
+   * @protected
    */
   this.targetTouches = [];