diff --git a/chrome/content/zotero/xpcom/data/library.js b/chrome/content/zotero/xpcom/data/library.js
index ac0fcdf7b..60edb9b85 100644
--- a/chrome/content/zotero/xpcom/data/library.js
+++ b/chrome/content/zotero/xpcom/data/library.js
@@ -102,12 +102,34 @@ Zotero.defineProperty(Zotero.Library.prototype, 'libraryID', {
 Zotero.defineProperty(Zotero.Library.prototype, 'id', {
 	get: function() this.libraryID,
 	set: function(val) this.libraryID = val
-});
+});
 Zotero.defineProperty(Zotero.Library.prototype, 'libraryType', {
 	get: function() this._get('_libraryType'),
 	set: function(v) this._set('_libraryType', v)
 });
 
+/**
+ * Get the library-type-specific id for the library (e.g., userID for user library,
+ * groupID for group library)
+ *
+ * @property
+ */
+Zotero.defineProperty(Zotero.Library.prototype, 'libraryTypeID', {
+	get: function () {
+		switch (this._libraryType) {
+		case 'user':
+		case 'publications':
+			return Zotero.Users.getCurrentUserID();
+		
+		case 'group':
+			return Zotero.Groups.getGroupIDFromLibraryID(this._libraryID);
+		
+		default:
+			throw new Error(`Cannot return library type id for ${this._libraryType} library`);
+		}
+	}
+});
+
 Zotero.defineProperty(Zotero.Library.prototype, 'libraryVersion', {
 	get: function() this._get('_libraryVersion'),
 	set: function(v) this._set('_libraryVersion', v)
diff --git a/test/tests/libraryTest.js b/test/tests/libraryTest.js
index 79eca29aa..548e69ad0 100644
--- a/test/tests/libraryTest.js
+++ b/test/tests/libraryTest.js
@@ -34,6 +34,14 @@ describe("Zotero.Library", function() {
 		});
 	});
 	
+	describe("#libraryTypeID", function () {
+		it("should return a group id for a group", function* () {
+			let library = yield createGroup();
+			assert.typeOf(library.libraryTypeID, 'number');
+			assert.equal(library.libraryTypeID, library.groupID);
+		})
+	})
+	
 	describe("#libraryVersion", function() {
 		it("should be settable to increasing values", function() {
 			let library = new Zotero.Library();