diff --git a/src/lib/dom.ts b/src/lib/dom.ts
index b70841ad..597d04fc 100644
--- a/src/lib/dom.ts
+++ b/src/lib/dom.ts
@@ -23,7 +23,7 @@ const logger = new Logging.Logger("dom")
  */
 export function isTextEditable(element: Element) {
     if (element) {
-        if (element.readOnly === true) return false
+        if ((element as any).readOnly === true) return false
         // HTML is always upper case, but XHTML is not necessarily upper case
         if (element.nodeName.toUpperCase() === "INPUT") {
             return isEditableHTMLInput(element as HTMLInputElement)