diff --git a/chrome/content/zotero/xpcom/schema.js b/chrome/content/zotero/xpcom/schema.js
index 9f5af6e7c..b605c2985 100644
--- a/chrome/content/zotero/xpcom/schema.js
+++ b/chrome/content/zotero/xpcom/schema.js
@@ -1335,6 +1335,10 @@ Zotero.Schema = new function(){
 			[
 				"SELECT COUNT(*) FROM fulltextItems WHERE itemID NOT IN (SELECT itemID FROM items WHERE itemTypeID=14)",
 				"DELETE FROM fulltextItems WHERE itemID NOT IN (SELECT itemID FROM items WHERE itemTypeID=14)"
+			],
+			[
+				"SELECT COUNT(*) FROM syncedSettings WHERE libraryID != 0 AND libraryID NOT IN (SELECT libraryID FROM libraries)",
+				"DELETE FROM syncedSettings WHERE libraryID != 0 AND libraryID NOT IN (SELECT libraryID FROM libraries)"
 			]
 		];