diff --git a/arch/platform/nrf52dk/contiki-conf.h b/arch/platform/nrf52dk/contiki-conf.h
index f52bf48d2..f8d7f8b1d 100644
--- a/arch/platform/nrf52dk/contiki-conf.h
+++ b/arch/platform/nrf52dk/contiki-conf.h
@@ -61,7 +61,11 @@
 
 /* 6LoWPAN */
 #define SICSLOWPAN_CONF_MAC_MAX_PAYLOAD         1280
+
+#ifndef SICSLOWPAN_CONF_FRAG
 #define SICSLOWPAN_CONF_FRAG                    0     /**< We don't use 6LoWPAN fragmentation as IPSP takes care of that for us.*/
+#endif
+
 #define SICSLOWPAN_FRAMER_HDRLEN                0     /**< Use fixed header len rather than framer.length() function */
 
 /* Packet buffer */