diff --git a/sys/net/sixlowpan/sixlowip.c b/sys/net/sixlowpan/sixlowip.c
index 99f7057665..7e027c9e38 100644
--- a/sys/net/sixlowpan/sixlowip.c
+++ b/sys/net/sixlowpan/sixlowip.c
@@ -369,6 +369,12 @@ void ipv6_print_addr(ipv6_addr_t *ipaddr){
         ((uint8_t *)ipaddr)[15]);      
 }
 
+uint8_t ipv6_next_hdr_unknown(uint8_t next_hdr) {
+    return  next_hdr == PROTO_NUM_ICMPV6 ||
+            next_hdr == PROTO_NUM_NONE;
+}
+
+
 uint32_t get_remaining_time(vtimer_t *t){
     timex_t time;
     time = vtimer_remaining(t);
diff --git a/sys/net/sixlowpan/sixlowip.h b/sys/net/sixlowpan/sixlowip.h
index 83f28729f1..ee73ae1e1c 100644
--- a/sys/net/sixlowpan/sixlowip.h
+++ b/sys/net/sixlowpan/sixlowip.h
@@ -165,4 +165,5 @@ void set_remaining_time(vtimer_t *t, uint32_t time);
 void ipv6_set_prefix(ipv6_addr_t *inout, ipv6_addr_t *prefix);
 uint8_t ipv6_addr_unspec_match(ipv6_addr_t *addr);
 uint8_t ipv6_addr_sol_node_mcast_match(ipv6_addr_t *addr);
+uint8_t ipv6_next_hdr_unrec(uint8_t next_hdr);
 #endif /* SIXLOWIP_H*/