diff --git a/editor/ui/composer/content/editor.js b/editor/ui/composer/content/editor.js
index 2c8b065ae950..590332ab8d96 100644
--- a/editor/ui/composer/content/editor.js
+++ b/editor/ui/composer/content/editor.js
@@ -2482,6 +2482,7 @@ function EditorSetDefaultPrefsAndDoctype()
           element.setAttribute("http-equiv", "content-type");
           element.setAttribute("content", "text/html; charset=" + prefCharsetString);
           headelement.insertBefore( element, headelement.firstChild );
+          editor.documentCharacterSet = prefCharsetString;
         }
     }