diff --git a/core/touch_gesture.js b/core/touch_gesture.js
index 6ff5dfcfe..67ee03238 100644
--- a/core/touch_gesture.js
+++ b/core/touch_gesture.js
@@ -135,6 +135,7 @@ Blockly.TouchGesture.prototype.bindMouseEvents = function(e) {
       /*opt_noCaptureIdentifier*/ true);
 
   e.preventDefault();
+  e.stopPropagation();
 };
 
 /**
@@ -143,7 +144,7 @@ Blockly.TouchGesture.prototype.bindMouseEvents = function(e) {
  * @package
  */
 Blockly.TouchGesture.prototype.handleStart = function(e) {
-  if (!this.isDragging) {
+  if (this.isDragging()) {
     // A drag has already started, so this can no longer be a pinch-zoom.
     return;
   }
@@ -238,8 +239,8 @@ Blockly.TouchGesture.prototype.handleTouchStart = function(e) {
     var point1 = this.cachedPoints_[pointers[1]];
     this.startDistance_ = goog.math.Coordinate.distance(point0, point1);
     this.isMultiTouch_ = true;
+    e.preventDefault();
   }
-  e.preventDefault();
 };
 
 /**
@@ -272,8 +273,8 @@ Blockly.TouchGesture.prototype.handleTouchMove = function(e) {
       workspace.zoom(position.x, position.y, delta);
     }
     this.previousScale_ = scale;
+    e.preventDefault();
   }
-  e.preventDefault();
 };
 
 /**