diff --git a/platform/sky/contiki-sky-main.c b/platform/sky/contiki-sky-main.c
index ba2c527c0..b17752215 100644
--- a/platform/sky/contiki-sky-main.c
+++ b/platform/sky/contiki-sky-main.c
@@ -26,7 +26,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * @(#)$Id: contiki-sky-main.c,v 1.71 2010/02/23 20:54:09 nifi Exp $
+ * @(#)$Id: contiki-sky-main.c,v 1.72 2010/02/23 21:02:30 nifi Exp $
  */
 
 #include <signal.h>
@@ -285,7 +285,7 @@ main(int argc, char **argv)
   NETSTACK_MAC.init();
   NETSTACK_NETWORK.init();
 
-  printf("%s %s, channel check rate %d Hz, radio channel %u\n",
+  printf("%s %s, channel check rate %lu Hz, radio channel %u\n",
          NETSTACK_MAC.name, NETSTACK_RDC.name,
          CLOCK_SECOND / (NETSTACK_RDC.channel_check_interval() == 0 ? 1:
                          NETSTACK_RDC.channel_check_interval()),