diff --git a/modules/libpref/moz.build b/modules/libpref/moz.build
index bff4fa68bbb4f7937632395351a0f8800815f862..d823accd1227635b555af2ca710645244d53aa12 100644
--- a/modules/libpref/moz.build
+++ b/modules/libpref/moz.build
@@ -93,6 +93,7 @@ pref_groups = [
     "view_source",
     "webgl",
     "widget",
+    "zen",
     "zoom",
 ]
 if CONFIG["OS_TARGET"] == "Android":
