diff --git a/examples/demo.js b/examples/demo.js
index 95854e389f..2e9630aa07 100644
--- a/examples/demo.js
+++ b/examples/demo.js
@@ -340,6 +340,7 @@ window.onload = function () {
       else
         step.imgElement.src = url;
       insertPreview.updatePreviews(url, document.querySelector('#addStep'));
+      DefaultHtmlStepUi(sequencer).updateDimensions(step);
     }
   });