diff --git a/chrome/content/zotero/xpcom/collectionTreeView.js b/chrome/content/zotero/xpcom/collectionTreeView.js
index e3c0bb970b..df84a671b6 100644
--- a/chrome/content/zotero/xpcom/collectionTreeView.js
+++ b/chrome/content/zotero/xpcom/collectionTreeView.js
@@ -1811,7 +1811,7 @@ Zotero.CollectionTreeView.prototype.canDropCheckAsync = Zotero.Promise.coroutine
 			// Dragging a collection to a different library
 			if (treeRow.ref.libraryID != draggedCollection.libraryID) {
 				// Disallow if linked collection already exists
-				if (yield draggedCollection.getLinkedCollection(treeRow.ref.libraryID)) {
+				if (yield draggedCollection.getLinkedCollection(treeRow.ref.libraryID, true)) {
 					return false;
 				}
 				
@@ -1822,7 +1822,7 @@ Zotero.CollectionTreeView.prototype.canDropCheckAsync = Zotero.Promise.coroutine
 					//
 					// If this is allowed in the future for the root collection,
 					// need to allow drag only to root
-					if (yield descendent.getLinkedCollection(treeRow.ref.libraryID)) {
+					if (yield descendent.getLinkedCollection(treeRow.ref.libraryID, true)) {
 						return false;
 					}
 				}