diff --git a/src/js/plugins/scroll.js b/src/js/plugins/scroll.js
index 2f3f17f..cc17e37 100644
--- a/src/js/plugins/scroll.js
+++ b/src/js/plugins/scroll.js
@@ -31,6 +31,7 @@ export default class Scroll {
    */
   onMouseWheel_(event) {
     if (this.ws_.isMoving) {
+      event.preventDefault();
       return;
     }