diff --git a/modules/libpref/moz.build b/modules/libpref/moz.build
index 46034d8d99ba227f85824d472933ec556f54ba81..42f7f68aba60ca9c8f85f5fe13ffb56fa542e344 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":