diff --git a/src/dom_components/view/ToolbarButtonView.js b/src/dom_components/view/ToolbarButtonView.js
index e50120e7b..6714d1468 100644
--- a/src/dom_components/view/ToolbarButtonView.js
+++ b/src/dom_components/view/ToolbarButtonView.js
@@ -37,7 +37,7 @@ export default Backbone.View.extend({
      * https://github.com/artf/grapesjs/issues/2207
      */
 
-    const { editor } = this;
+    const { editor, em } = this;
     const { left, top } = editor.Canvas.getFrameEl().getBoundingClientRect();
 
     const calibrated = {