diff --git a/chrome/locale/en-US/zotero/zotero.ftl b/chrome/locale/en-US/zotero/zotero.ftl
index e314f8ee5d..15218fcac3 100644
--- a/chrome/locale/en-US/zotero/zotero.ftl
+++ b/chrome/locale/en-US/zotero/zotero.ftl
@@ -442,10 +442,6 @@ sidenav-tags =
     .tooltiptext = { pane-tags }
 sidenav-related =
     .tooltiptext = { pane-related }
-sidenav-collapse =
-    .tooltiptext = Collapse Sidebar
-sidenav-expand =
-    .tooltiptext = Expand Sidebar
 
 pin-section =
     .label = Pin Section