diff --git a/xpfe/appshell/AppWindow.cpp b/xpfe/appshell/AppWindow.cpp
index 69157dd642fe2f20bd77fb9e39fe3ae0c2806176..d4d0aa69ae6e3fd995255f22e1088eca0e58e959 100644
--- a/xpfe/appshell/AppWindow.cpp
+++ b/xpfe/appshell/AppWindow.cpp
@@ -1845,7 +1845,7 @@ nsresult AppWindow::MaybeSaveEarlyWindowPersistentValues(
     }
   }
 
-  settings.verticalTabs = Preferences::GetBool("sidebar.verticalTabs", false);
+  settings.verticalTabs = Preferences::GetBool("zen.tabs.vertical", false);
 
   Unused << PersistPreXULSkeletonUIValues(settings);
 #endif