diff --git a/platform/mb851/contiki-conf.h b/platform/mb851/contiki-conf.h
index 0450fbfb6..06763b8f7 100644
--- a/platform/mb851/contiki-conf.h
+++ b/platform/mb851/contiki-conf.h
@@ -96,9 +96,16 @@
 #define XMAC_CONF_ANNOUNCEMENTS                 0
 #define XMAC_CONF_COMPOWER                      1
 
-/* Other */
+/* Other (RAM saving) */
 #define ENERGEST_CONF_ON                        0
 #define QUEUEBUF_CONF_NUM                       2
+#define QUEUEBUF_CONF_REF_NUM                   0
+#define UIP_CONF_DS6_NBR_NBU                    4
+#define UIP_CONF_DS6_ROUTE_NBU                  4
+#define RPL_CONF_MAX_PARENTS_PER_DAG            4
+#define RPL_CONF_MAX_INSTANCES                  1
+#define RPL_CONF_MAX_DAG_PER_INSTANCE           1
+#define PROCESS_CONF_NUMEVENTS                  16
 
 #if WITH_UIP6
 
diff --git a/platform/mbxxx/contiki-conf.h b/platform/mbxxx/contiki-conf.h
index 90895a86b..e39be6c6a 100644
--- a/platform/mbxxx/contiki-conf.h
+++ b/platform/mbxxx/contiki-conf.h
@@ -96,9 +96,16 @@
 #define XMAC_CONF_ANNOUNCEMENTS                 0
 #define XMAC_CONF_COMPOWER                      1
 
-/* Other */
+/* Other (RAM saving) */
 #define ENERGEST_CONF_ON                        0
 #define QUEUEBUF_CONF_NUM                       2
+#define QUEUEBUF_CONF_REF_NUM                   0
+#define UIP_CONF_DS6_NBR_NBU                    4
+#define UIP_CONF_DS6_ROUTE_NBU                  4
+#define RPL_CONF_MAX_PARENTS_PER_DAG            4
+#define RPL_CONF_MAX_INSTANCES                  1
+#define RPL_CONF_MAX_DAG_PER_INSTANCE           1
+#define PROCESS_CONF_NUMEVENTS                  16
 
 #if WITH_UIP6