diff --git a/mozilla/lib/Makefile b/mozilla/lib/Makefile
index f241a6e1404..e5ddbd1046e 100644
--- a/mozilla/lib/Makefile
+++ b/mozilla/lib/Makefile
@@ -51,6 +51,10 @@ endif
 
 DIRS	+= libmocha libstyle
 
+ifdef DOM
+DIRS	+= libdom
+endif
+
 ifeq ($(OS_ARCH),OS2)
 DIRS	+= libcnv
 endif