diff --git a/src/dispatcher.js b/src/dispatcher.js
index 5fcf682..08bce01 100644
--- a/src/dispatcher.js
+++ b/src/dispatcher.js
@@ -41,6 +41,7 @@
     'screenY',
     'pageX',
     'pageY',
+    'tapPrevented'
   ];
 
   var CLONE_DEFAULTS = [
diff --git a/src/tap.js b/src/tap.js
index 6b24ef7..e7d3dc1 100644
--- a/src/tap.js
+++ b/src/tap.js
@@ -35,7 +35,7 @@
  */
 (function(scope) {
   var dispatcher = scope.dispatcher;
-  var pointermap = new scope.PointerMap;
+  var pointermap = new scope.PointerMap();
   var tap = {
     events: [
       'pointerdown',