diff --git a/chrome/skin/default/zotero/overlay.css b/chrome/skin/default/zotero/overlay.css
index 96f0b9bfcc..b4f11a631f 100644
--- a/chrome/skin/default/zotero/overlay.css
+++ b/chrome/skin/default/zotero/overlay.css
@@ -186,7 +186,7 @@ TODO: Replace with SVG
 }
 
 #zotero-layout-switcher[orient="horizontal"] #zotero-items-pane-container {
-	width: auto !important;
+	width: 0 !important;
 }
 
 #zotero-layout-switcher[orient="vertical"],