diff --git a/chrome/content/zotero/collectionTree.jsx b/chrome/content/zotero/collectionTree.jsx
index 156c7c4197..b46b65cf98 100644
--- a/chrome/content/zotero/collectionTree.jsx
+++ b/chrome/content/zotero/collectionTree.jsx
@@ -1615,7 +1615,7 @@ var CollectionTree = class CollectionTree extends LibraryTree {
 					return false;
 				}
 				
-				let newAttachment = Zotero.Attachments.copyAttachmentToLibrary(item, targetLibraryID);
+				let newAttachment = await Zotero.Attachments.copyAttachmentToLibrary(item, targetLibraryID);
 				if (options.annotations) {
 					await Zotero.Items.copyChildItems(item, newAttachment);
 				}
diff --git a/test/tests/collectionTreeTest.js b/test/tests/collectionTreeTest.js
index ab3be2bfa3..c49f6d72cb 100644
--- a/test/tests/collectionTreeTest.js
+++ b/test/tests/collectionTreeTest.js
@@ -891,6 +891,24 @@ describe("Zotero.CollectionTree", function() {
 				return group.eraseTx();
 			});
 			
+			it("should copy a standalone attachment to a group", async function () {
+				await Zotero.Users.setCurrentUserID(1);
+				await Zotero.Users.setName(1, 'Name 1');
+				await Zotero.Users.setName(12345, 'Name 2');
+				
+				var group = await createGroup();
+				
+				var item = await importPDFAttachment();
+				
+				var ids = (await onDrop('item', 'L' + group.libraryID, [item.id])).ids;
+				var newItem = Zotero.Items.get(ids[0]);
+				
+				assert.equal(newItem.libraryID, group.libraryID);
+				assert.isTrue(newItem.isPDFAttachment());
+				
+				return group.eraseTx();
+			});
+			
 			it("should not copy an item or its attachment to a group twice", function* () {
 				var group = yield getGroup();