diff --git a/browser/base/moz.build b/browser/base/moz.build
index 286e17552e2ab2d7e44c6ba99c84630cadd24e94..076f813aea971db1e1c1429fc0b64c1784a22722 100644
--- a/browser/base/moz.build
+++ b/browser/base/moz.build
@@ -78,3 +78,5 @@ DEFINES["MOZ_APP_VERSION_DISPLAY"] = CONFIG["MOZ_APP_VERSION_DISPLAY"]
 DEFINES["APP_LICENSE_BLOCK"] = "%s/content/overrides/app-license.html" % SRCDIR
 
 JAR_MANIFESTS += ["jar.mn"]
+
+DIRS += ["../../zen"]