diff --git a/platform/sky/Makefile.sky b/platform/sky/Makefile.sky
index 5cfcb72a5..bfb7bf462 100644
--- a/platform/sky/Makefile.sky
+++ b/platform/sky/Makefile.sky
@@ -1,11 +1,11 @@
-# $Id: Makefile.sky,v 1.35 2010/02/02 20:59:45 joxe Exp $
+# $Id: Makefile.sky,v 1.36 2010/02/13 11:20:48 joxe Exp $
 
 
 ARCH=msp430.c leds.c watchdog.c spi.c ds2411.c \
      xmem.c i2c.c sht11.c light-sensor.c acc-sensor.c battery-sensor.c \
      cc2420.c cc2420-aes.c cc2420-arch.c cc2420-arch-sfd.c sht11-sensor.c \
      node-id.c sensors.c button-sensor.c cfs-coffee.c sky-sensors.c\
-     radio-sensor.c uart1.c uip-ipchksum.c \
+     radio-sensor.c uart1.c uip-ipchksum.c ext-sensor.c\
      checkpoint-arch.c #slip.c slip_uart1.c
 
 #ext-sensor.c irq.c \
diff --git a/platform/sky/dev/ext-sensor.c b/platform/sky/dev/ext-sensor.c
index c4878e35a..6267520b3 100644
--- a/platform/sky/dev/ext-sensor.c
+++ b/platform/sky/dev/ext-sensor.c
@@ -26,15 +26,15 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $Id: ext-sensor.c,v 1.2 2010/02/06 14:41:24 adamdunkels Exp $
+ * $Id: ext-sensor.c,v 1.3 2010/02/13 11:20:48 joxe Exp $
  *
  * -----------------------------------------------------------------
  *
  * Author  : Adam Dunkels, Joakim Eriksson, Niclas Finne, Marcus Lundén,
  *           Jesper Karlsson
  * Created : 2005-11-01
- * Updated : $Date: 2010/02/06 14:41:24 $
- *           $Revision: 1.2 $
+ * Updated : $Date: 2010/02/13 11:20:48 $
+ *           $Revision: 1.3 $
  */
 
 #include <io.h>
@@ -86,13 +86,13 @@ configure(int type, int c)
         if(!status(SENSORS_ACTIVE)) {
           /* SREF_1 is Vref+ */
           /* MemReg6 == P6.0/A0 == port "under" logo */
-          ADC12MCTL6 = (INCH_0 + SREF_1);
+          ADC12MCTL6 = (INCH_0 + SREF_0);
           /* MemReg7 == P6.1/A1 == port "over" logo */
-          ADC12MCTL7 = (INCH_1 + SREF_1);
+          ADC12MCTL7 = (INCH_1 + SREF_0);
           /* MemReg8 == P6.2/A2, bottom expansion port */
-          ADC12MCTL8 = (INCH_2 + SREF_1);
+          ADC12MCTL8 = (INCH_2 + SREF_0);
           /* MemReg9 == P6.1/A3, bottom expansion port, End Of (ADC-)Sequence */
-          ADC12MCTL9 = (INCH_3 + SREF_1);
+          ADC12MCTL9 = (INCH_3 + SREF_0);
 
           sky_sensors_activate(0x0F);
           active = 1;
@@ -107,4 +107,3 @@ configure(int type, int c)
 /*---------------------------------------------------------------------------*/
 SENSORS_SENSOR(ext_sensor, "Ext",
          value, configure, status);
-
diff --git a/platform/sky/dev/ext-sensor.h b/platform/sky/dev/ext-sensor.h
index 159ac30a7..8fed8b59f 100644
--- a/platform/sky/dev/ext-sensor.h
+++ b/platform/sky/dev/ext-sensor.h
@@ -26,14 +26,14 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $Id: ext-sensor.h,v 1.1 2009/08/25 16:24:49 adamdunkels Exp $
+ * $Id: ext-sensor.h,v 1.2 2010/02/13 11:20:48 joxe Exp $
  *
  * -----------------------------------------------------------------
  *
  * Author  : Marcus Lundén
  * Created : 2005-11-01
- * Updated : $Date: 2009/08/25 16:24:49 $
- *           $Revision: 1.1 $
+ * Updated : $Date: 2010/02/13 11:20:48 $
+ *           $Revision: 1.2 $
  */
 
 #ifndef __EXT_SENSOR_H__
@@ -41,6 +41,11 @@
 
 #include "lib/sensors.h"
 
+#define ADC0 0
+#define ADC1 1
+#define ADC2 2
+#define ADC3 3
+
 extern const struct sensors_sensor ext_sensor;
 
 #define EXT_SENSOR "Ext"