diff --git a/platform/avr-raven/contiki-conf.h b/platform/avr-raven/contiki-conf.h
index a2e8509ae..462c12bb7 100644
--- a/platform/avr-raven/contiki-conf.h
+++ b/platform/avr-raven/contiki-conf.h
@@ -62,10 +62,10 @@
 
 #define CCIF
 #define CLIF
-#define SICSLOWPAN_CONF_COMPRESSION_HC01 2
+
 #define RIMEADDR_CONF_SIZE       8
-#define SICSLOWPAN_CONF_COMPRESSION       SICSLOWPAN_CONF_COMPRESSION_HC01
-//#define SICSLOWPAN_CONF_COMPRESSION       SICSLOWPAN_COMPRESSION_HC06
+
+#define SICSLOWPAN_CONF_COMPRESSION       SICSLOWPAN_COMPRESSION_HC06
 
 /* RF230BB must be used with low power protocols */
 #if RF230BB
diff --git a/platform/avr-ravenusb/contiki-conf.h b/platform/avr-ravenusb/contiki-conf.h
index 316058140..07d36a90b 100644
--- a/platform/avr-ravenusb/contiki-conf.h
+++ b/platform/avr-ravenusb/contiki-conf.h
@@ -78,15 +78,7 @@ typedef int32_t s32_t;
 
 #define RIMEADDR_CONF_SIZE       8
 
-/* 0 for IPv6, or 1 for HC1, 2 for HC01 */
-//#define SICSLOWPAN_CONF_COMPRESSION_IPV6 0 
-//#define SICSLOWPAN_CONF_COMPRESSION_HC1 1 
-#define SICSLOWPAN_CONF_COMPRESSION_HC01 2
-//#ifndef SICSLOWPAN_COMPRESSION_HC06
-//#warning hc06 not defined
-//#endif
-#define SICSLOWPAN_CONF_COMPRESSION       SICSLOWPAN_CONF_COMPRESSION_HC01 
-//#define SICSLOWPAN_CONF_COMPRESSION       SICSLOWPAN_COMPRESSION_HC06
+#define SICSLOWPAN_CONF_COMPRESSION       SICSLOWPAN_COMPRESSION_HC06
 #define SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS 2
 
 #define UIP_CONF_LL_802154       1