diff --git a/mozilla/xpfe/Makefile.in b/mozilla/xpfe/Makefile.in
index fc80ccdf10c..0f57007d522 100644
--- a/mozilla/xpfe/Makefile.in
+++ b/mozilla/xpfe/Makefile.in
@@ -22,7 +22,7 @@ VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-DIRS = appshell bootstrap browser
+DIRS = AppCores appshell bootstrap browser
 
 include $(topsrcdir)/config/config.mk