diff --git a/mozilla/mailnews/makefiles b/mozilla/mailnews/makefiles
index a6f9da2bf4a..9fb0cbc8668 100644
--- a/mozilla/mailnews/makefiles
+++ b/mozilla/mailnews/makefiles
@@ -101,6 +101,7 @@ mailnews/mime/tests/xpcomtest/Makefile
 mailnews/mime/tests/mimetest/Makefile
 mailnews/mime/public/Makefile
 mailnews/mime/src/Makefile
+mailnews/mime/build/Makefile
 mailnews/mime/resources/Makefile
 mailnews/mime/resources/skin/Makefile
 mailnews/mime/resources/content/Makefile