diff --git a/layout/xul/Makefile.in b/layout/xul/Makefile.in
index ba2c51945de..46b8006e0f8 100644
--- a/layout/xul/Makefile.in
+++ b/layout/xul/Makefile.in
@@ -22,7 +22,7 @@ VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-DIRS = content
+DIRS = content base
 
 include $(topsrcdir)/config/config.mk