diff --git a/client/modules/IDE/components/PreviewFrame.jsx b/client/modules/IDE/components/PreviewFrame.jsx
index bf3313b4..58a504d6 100644
--- a/client/modules/IDE/components/PreviewFrame.jsx
+++ b/client/modules/IDE/components/PreviewFrame.jsx
@@ -407,7 +407,7 @@ class PreviewFrame extends React.Component {
         frameBorder="0"
         title="sketch output"
         ref={(element) => { this.iframeElement = element; }}
-        sandbox="allow-scripts allow-pointer-lock allow-same-origin allow-popups allow-forms"
+        sandbox="allow-scripts allow-pointer-lock allow-same-origin allow-popups allow-forms allow-modals"
       />
     );
   }