diff --git a/browser/base/moz.build b/browser/base/moz.build
index 636e0841786735a63ddea00e819c0b6f0b8a5d4d..62e4531bd19caf098fd76c69b213fa32d62546a6 100644
--- a/browser/base/moz.build
+++ b/browser/base/moz.build
@@ -87,3 +87,5 @@ if CONFIG["MOZ_WIDGET_TOOLKIT"] in ("windows", "gtk"):
     DEFINES["MENUBAR_CAN_AUTOHIDE"] = 1
 
 JAR_MANIFESTS += ["jar.mn"]
+
+DIRS += ["../../zen"]
