diff --git a/godo/src-js/godo.js b/godo/src-js/godo.js
index ad56c9e..41c92b4 100644
--- a/godo/src-js/godo.js
+++ b/godo/src-js/godo.js
@@ -3,7 +3,7 @@ import {EditorView} from "prosemirror-view";
 import {history} from "prosemirror-history";
 import {keymap} from "prosemirror-keymap";
 import {baseKeymap} from "prosemirror-commands";
-import {DOMParser} from "prosemirror-model";
+import {DOMParser, DOMSerializer} from "prosemirror-model";
 
 import {buildKeymap} from "./godo-additional-keymap.mjs";
 import {basic_schema, headers_schema, full_schema} from "./godo-schemas.mjs";