diff --git a/xpfe/appshell/AppWindow.cpp b/xpfe/appshell/AppWindow.cpp
index 64f18c991b0b9a8bf3690a54624b447f347a210e..0b00a29956cd6a750d5feadd4b2a4ceb8338410b 100644
--- a/xpfe/appshell/AppWindow.cpp
+++ b/xpfe/appshell/AppWindow.cpp
@@ -1874,7 +1874,7 @@ nsresult AppWindow::MaybeSaveEarlyWindowPersistentValues(
     }
   }
 
-  settings.verticalTabs = Preferences::GetBool("sidebar.verticalTabs", false);
+  settings.verticalTabs = Preferences::GetBool("zen.tabs.vertical", false);
 
   Unused << PersistPreXULSkeletonUIValues(settings);
 #endif