diff --git a/platform/sky/Makefile.sky b/platform/sky/Makefile.sky
index 009686e01..755c5998a 100644
--- a/platform/sky/Makefile.sky
+++ b/platform/sky/Makefile.sky
@@ -1,4 +1,4 @@
-# $Id: Makefile.sky,v 1.25 2009/04/29 11:42:56 adamdunkels Exp $
+# $Id: Makefile.sky,v 1.26 2009/06/26 12:00:49 joxe Exp $
 
 
 ARCH=msp430.c leds.c watchdog.c light.c spi.c ds2411.c \
@@ -13,6 +13,10 @@ ifndef CONTIKI_TARGET_MAIN
 CONTIKI_TARGET_MAIN = contiki-sky-main.c
 endif
 
+ifdef UIP_CONF_IPV6
+CFLAGS += -DWITH_UIP6=1
+endif
+
 CONTIKI_TARGET_SOURCEFILES += $(ARCH) $(UIPDRIVERS) $(CONTIKI_TARGET_MAIN)
 
 MCU=msp430x1611