diff --git a/app/assets/javascripts/pretty-text/addon/allow-lister.js b/app/assets/javascripts/pretty-text/addon/allow-lister.js
index b044c7cc073..91a33bef3f3 100644
--- a/app/assets/javascripts/pretty-text/addon/allow-lister.js
+++ b/app/assets/javascripts/pretty-text/addon/allow-lister.js
@@ -171,6 +171,7 @@ export const DEFAULT_LIST = [
   "iframe[marginwidth]",
   "iframe[width]",
   "iframe[allowfullscreen]",
+  "iframe[allow]",
   "img[alt]",
   "img[height]",
   "img[title]",