diff --git a/mailnews/Makefile.in b/mailnews/Makefile.in
index bc22924864f5..627ee9101590 100644
--- a/mailnews/Makefile.in
+++ b/mailnews/Makefile.in
@@ -26,7 +26,7 @@ VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-DIRS		= public base db news local mime compose imap addrbook import absync
+DIRS		= public base db news local mime compose imap addrbook import absync extensions
 
 include $(topsrcdir)/config/rules.mk
 
diff --git a/mailnews/makefiles b/mailnews/makefiles
index f732686f89f7..f8ce6ef086f9 100644
--- a/mailnews/makefiles
+++ b/mailnews/makefiles
@@ -56,4 +56,7 @@ mailnews/import/public/Makefile
 mailnews/import/src/Makefile
 mailnews/import/text/Makefile
 mailnews/import/text/src/Makefile
-
+mailnews/extensions/smime/Makefile
+mailnews/extensions/smime/build/Makefile
+mailnews/extensions/smime/src/Makefile
+mailnews/extensions/smime/public/Makefile