diff --git a/assets/prefs.js b/assets/prefs.js
index 10f1792..21897a9 100644
--- a/assets/prefs.js
+++ b/assets/prefs.js
@@ -13,6 +13,7 @@ lockPref("signon.rememberSignons", false);
 lockPref("browser.download.viewableInternally.typeWasRegistered.jxl", true);
 lockPref("image.jxl.enabled", true);
 lockPref("xpinstall.signatures.required", false);
+lockPref("browser.theme.macos.native-theme", false);
 
 // Allow custom search engines
 pref("browser.urlbar.update2.engineAliasRefresh", true); // No clue why this needs both pref and lockPref but here we are