diff --git a/xpfe/appshell/AppWindow.cpp b/xpfe/appshell/AppWindow.cpp
index 43b1546c4f4e4a2cba57c69ffb414c0b26c21ddd..0989f74f2f2e219162298d6ad7ea5c68ca9491a1 100644
--- a/xpfe/appshell/AppWindow.cpp
+++ b/xpfe/appshell/AppWindow.cpp
@@ -1879,7 +1879,7 @@ nsresult AppWindow::MaybeSaveEarlyWindowPersistentValues(
     }
   }
 
-  settings.verticalTabs = Preferences::GetBool("sidebar.verticalTabs", false);
+  settings.verticalTabs = Preferences::GetBool("zen.tabs.vertical", false);
 
   (void)PersistPreXULSkeletonUIValues(settings);
 #endif