diff --git a/modules/libpref/moz.build b/modules/libpref/moz.build
index 4e582caaa58884b27be20c45e4c39b0b841261ef..f8ce17a33f20380b3f56a3774e043b9fba849977 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":
