diff --git a/platform/wismote/contiki-conf.h b/platform/wismote/contiki-conf.h
index 9b3b138cc..b8d4a6fda 100644
--- a/platform/wismote/contiki-conf.h
+++ b/platform/wismote/contiki-conf.h
@@ -31,6 +31,7 @@
 #define CC2520_CONF_AUTOACK              1
 #endif /* CC2520_CONF_AUTOACK */
 
+#define NULLRDC_CONF_802154_AUTOACK      1
 
 #if WITH_UIP6
 /* Network setup for IPv6 */