diff --git a/sys/net/net_help/Makefile b/sys/net/net_help/Makefile
index 633d89730f..bb2381c4b3 100644
--- a/sys/net/net_help/Makefile
+++ b/sys/net/net_help/Makefile
@@ -1,4 +1,4 @@
 MODULE:=$(shell basename $(CURDIR))
-INCLUDES = -I$(RIOTBASE) -I$(RIOTBASE)/sys/include -I$(RIOTBASE)/core/include -I$(RIOTBASE)/sys/net/sixlowpan/include
+INCLUDES += -I$(RIOTBASE) -I$(RIOTBASE)/sys/include -I$(RIOTBASE)/core/include -I$(RIOTBASE)/sys/net/sixlowpan/include
 
 include $(RIOTBASE)/Makefile.base
diff --git a/sys/net/sixlowpan/Makefile b/sys/net/sixlowpan/Makefile
index 4e0b8e4cc2..ef6e3de4e0 100644
--- a/sys/net/sixlowpan/Makefile
+++ b/sys/net/sixlowpan/Makefile
@@ -1,4 +1,4 @@
 MODULE:=$(shell basename $(CURDIR))
-INCLUDES = -I$(RIOTBASE) -I$(RIOTBASE)/sys/include -I$(RIOTBASE)/core/include -I$(RIOTBASE)/drivers/include -I$(RIOTBASE)/cpu/arm_common/include -I$(RIOTBASE)/sys/net/sixlowpan/include/
+INCLUDES = -I$(RIOTBASE) -I$(RIOTBASE)/sys/include -I$(RIOTBASE)/core/include -I$(RIOTBASE)/drivers/include -I$(RIOTBASE)/drivers/cc110x_ng/include -I$(RIOTBASE)/cpu/arm_common/include -I$(RIOTBASE)/sys/net/sixlowpan/include/
 
 include $(RIOTBASE)/Makefile.base