diff --git a/www/whiteboard/inner.js b/www/whiteboard/inner.js
index 1c1e5c563..b0b382314 100644
--- a/www/whiteboard/inner.js
+++ b/www/whiteboard/inner.js
@@ -419,7 +419,7 @@ define([
             $canvas[0].toBlob(function (blob) {
                 cb(blob);
             });
-        });
+        }, true);
 
         framework.setNormalizer(function (c) {
             return {