diff --git a/platform/sky/contiki-conf.h b/platform/sky/contiki-conf.h
index 9e7c83b40..fa0e16a20 100644
--- a/platform/sky/contiki-conf.h
+++ b/platform/sky/contiki-conf.h
@@ -212,7 +212,9 @@
 
 #define UIP_CONF_TCP_SPLIT       0
 
-
+#ifndef AES_128_CONF
+#define AES_128_CONF cc2420_aes_128_driver
+#endif /* AES_128_CONF */
 
 /* include the project config */
 /* PROJECT_CONF_H might be defined in the project Makefile */