diff --git a/mozilla/mailnews/makefile.win b/mozilla/mailnews/makefile.win
index 8dfb8484768..4dfb8f5df2d 100644
--- a/mozilla/mailnews/makefile.win
+++ b/mozilla/mailnews/makefile.win
@@ -21,7 +21,7 @@
 
 DEPTH=..
 
-DIRS=public base db local news imap mime compose addrbook import absync mapi
+DIRS=public base db local news imap mime compose addrbook import absync mapi extensions
 
 include <$(DEPTH)\config\rules.mak>