diff --git a/app/assets/javascripts/pretty-text/white-lister.js.es6 b/app/assets/javascripts/pretty-text/white-lister.js.es6
index 40918c49c3f..5ea109398bb 100644
--- a/app/assets/javascripts/pretty-text/white-lister.js.es6
+++ b/app/assets/javascripts/pretty-text/white-lister.js.es6
@@ -167,6 +167,7 @@ const DEFAULT_LIST = [
   "iframe[marginheight]",
   "iframe[marginwidth]",
   "iframe[width]",
+  "iframe[allowfullscreen]",
   "img[alt]",
   "img[height]",
   "img[title]",