diff --git a/chrome/content/zotero/xpcom/data/item.js b/chrome/content/zotero/xpcom/data/item.js
index 435c3d5d77..602bcaa3e0 100644
--- a/chrome/content/zotero/xpcom/data/item.js
+++ b/chrome/content/zotero/xpcom/data/item.js
@@ -4598,7 +4598,7 @@ Zotero.Item.prototype.clone = function (libraryID, options = {}) {
  * @return {Zotero.Item} - New item
  */
 Zotero.Item.prototype.moveToLibrary = async function (libraryID, onSkippedAttachment) {
-	if (!this.isEditable) {
+	if (!this.isEditable()) {
 		throw new Error("Can't move item in read-only library");
 	}
 	var library = Zotero.Libraries.get(libraryID);