diff --git a/cpu/msp430/cc2420-arch-sfd.c b/cpu/msp430/cc2420-arch-sfd.c
index abd8b30ce..023130baa 100644
--- a/cpu/msp430/cc2420-arch-sfd.c
+++ b/cpu/msp430/cc2420-arch-sfd.c
@@ -26,7 +26,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * @(#)$Id: cc2420-arch-sfd.c,v 1.1 2009/12/05 19:42:56 adamdunkels Exp $
+ * @(#)$Id: cc2420-arch-sfd.c,v 1.2 2010/01/19 13:11:01 adamdunkels Exp $
  */
 
 #include <io.h>
@@ -35,6 +35,7 @@
 #include "dev/spi.h"
 #include "dev/cc2420.h"
 
+uint8_t cc2420_arch_sfd_counter;
 uint16_t cc2420_arch_sfd_start_time;
 uint16_t cc2420_arch_sfd_end_time;
 
@@ -48,8 +49,10 @@ cc24240_timerb1_interrupt(void)
   /* always read TBIV to clear IFG */
   tbiv = TBIV;
   if(SFD_IS_1) {
+    cc2420_arch_sfd_counter++;
     cc2420_arch_sfd_start_time = TBCCR1;
   } else {
+    cc2420_arch_sfd_counter = 0;
     cc2420_arch_sfd_end_time = TBCCR1;
   }
   ENERGEST_OFF(ENERGEST_TYPE_IRQ);
diff --git a/cpu/msp430/cc2420-arch-sfd.h b/cpu/msp430/cc2420-arch-sfd.h
index f72602ed7..d11038dfc 100644
--- a/cpu/msp430/cc2420-arch-sfd.h
+++ b/cpu/msp430/cc2420-arch-sfd.h
@@ -26,11 +26,15 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * @(#)$Id: cc2420-arch-sfd.h,v 1.1 2009/12/05 19:42:56 adamdunkels Exp $
+ * @(#)$Id: cc2420-arch-sfd.h,v 1.2 2010/01/19 13:11:01 adamdunkels Exp $
  */
 #ifndef CC2420_ARCH_SFD_H
 #define CC2420_ARCH_SFD_H
 
+extern uint8_t cc2420_arch_sfd_counter;
+extern uint16_t cc2420_arch_sfd_start_time;
+extern uint16_t cc2420_arch_sfd_end_time;
+
 void cc2420_arch_sfd_init(void);
 
 #endif /* CC2420_ARCH_SFD_H */