diff --git a/sys/Makefile b/sys/Makefile
index d4da789e99..10f9a9b948 100644
--- a/sys/Makefile
+++ b/sys/Makefile
@@ -75,6 +75,8 @@ ifneq (,$(findstring protocol-multiplex,$(USEMODULE)))
 endif
 ifneq (,$(findstring sixlowpan,$(USEMODULE)))
     DIRS += net/sixlowpan
+endif
+ifneq (,$(findstring rpl,$(USEMODULE)))
     DIRS += net/sixlowpan/rpl
 endif
 ifneq (,$(findstring ieee802154,$(USEMODULE)))