diff --git a/platform/sky/contiki-conf.h b/platform/sky/contiki-conf.h
index 7a4ecbc8c..19d822e58 100644
--- a/platform/sky/contiki-conf.h
+++ b/platform/sky/contiki-conf.h
@@ -47,7 +47,7 @@
    enabled. This is needed for ContikiMAC, which needs packets to be
    larger than a specified size, if no ContikiMAC header should be
    used. */
-#define SICSLOWPAN_CONF_COMPRESSION_THRESHOLD 60
+#define SICSLOWPAN_CONF_COMPRESSION_THRESHOLD 63
 #define CONTIKIMAC_CONF_WITH_CONTIKIMAC_HEADER 0
 
 #define CXMAC_CONF_ANNOUNCEMENTS         0
diff --git a/platform/z1/contiki-conf.h b/platform/z1/contiki-conf.h
index f3c6240b3..9b3ee32a4 100644
--- a/platform/z1/contiki-conf.h
+++ b/platform/z1/contiki-conf.h
@@ -50,7 +50,7 @@
    enabled. This is needed for ContikiMAC, which needs packets to be
    larger than a specified size, if no ContikiMAC header should be
    used. */
-#define SICSLOWPAN_CONF_COMPRESSION_THRESHOLD 60
+#define SICSLOWPAN_CONF_COMPRESSION_THRESHOLD 63
 #define CONTIKIMAC_CONF_WITH_CONTIKIMAC_HEADER 0
 
 #define CC2420_CONF_AUTOACK              1