diff --git a/chrome/content/zotero/elements/relatedBox.js b/chrome/content/zotero/elements/relatedBox.js
index d27bba0dc4..3113785c61 100644
--- a/chrome/content/zotero/elements/relatedBox.js
+++ b/chrome/content/zotero/elements/relatedBox.js
@@ -187,7 +187,7 @@
 				return;
 			}
 			if (relItems[0].libraryID != this._item.libraryID) {
-				Zotero.alert.alert(null, "", "You cannot relate items in different libraries.");
+				Zotero.alert(null, "", "You cannot relate items in different libraries.");
 				return;
 			}
 			await Zotero.DB.executeTransaction(async () => {