diff --git a/windows/Firefox/App/DefaultData/profile/prefs.js b/windows/Firefox/App/DefaultData/profile/prefs.js
index 3022dfe..ed79a4c 100644
--- a/windows/Firefox/App/DefaultData/profile/prefs.js
+++ b/windows/Firefox/App/DefaultData/profile/prefs.js
@@ -31,6 +31,7 @@ user_pref("datareporting.sessions.current.clean", true);
 user_pref("extensions.autoDisableScopes", 0);
 user_pref("general.warnOnAboutConfig", false);
 user_pref("geo.enabled", false);
+user_pref("intl.locale.matchOS", true);
 user_pref("keyword.enabled", false);
 user_pref("media.eme.enabled", false);
 user_pref("media.gmp-eme-adobe.enabled", false);