diff --git a/chrome/content/zotero/overlay.xul b/chrome/content/zotero/overlay.xul
index 81b888186..c4c84b121 100644
--- a/chrome/content/zotero/overlay.xul
+++ b/chrome/content/zotero/overlay.xul
@@ -110,7 +110,7 @@
 					onselect="ZoteroPane.onCollectionSelected();" seltype="single"
 					ondragdrop="nsDragAndDrop.drop(event,ZoteroPane.getCollectionsView())"
 					ondraggesture="if (event.target.localName == 'treechildren') nsDragAndDrop.startDrag(event,ZoteroPane.getCollectionsView());"
-					onkeypress="if (event.keyCode == event.DOM_VK_BACK_SPACE || event.keyCode == event.DOM_VK_DELETE){ ZoteroPane.deleteSelectedCollection(); } event.preventDefault();"
+					onkeypress="if (event.keyCode == event.DOM_VK_BACK_SPACE || event.keyCode == event.DOM_VK_DELETE){ ZoteroPane.deleteSelectedCollection(); event.preventDefault(); }"
 					flex="1">
 					<treecols>
 						<treecol
@@ -154,7 +154,7 @@
 					id="zotero-items-tree" context="zotero-itemmenu"
 					ondblclick="ZoteroPane.onDoubleClick(event, this);"
 					enableColumnDrag="true"
-					onkeypress="if (event.keyCode == event.DOM_VK_BACK_SPACE || event.keyCode == event.DOM_VK_DELETE){ ZoteroPane.deleteSelectedItem(); } event.preventDefault();"
+					onkeypress="if (event.keyCode == event.DOM_VK_BACK_SPACE || event.keyCode == event.DOM_VK_DELETE){ ZoteroPane.deleteSelectedItem(); event.preventDefault(); }"
 					onselect="ZoteroPane.itemSelected();"
 					ondraggesture="if (event.target.localName == 'treechildren') nsDragAndDrop.startDrag(event,ZoteroPane.getItemsView());"
 					ondragover="nsDragAndDrop.dragOver(event,ZoteroPane.getItemsView())"