diff --git a/sys/net/network_layer/sixlowpan/icmp.c b/sys/net/network_layer/sixlowpan/icmp.c
index c88a9946d3..0c1589b3a2 100644
--- a/sys/net/network_layer/sixlowpan/icmp.c
+++ b/sys/net/network_layer/sixlowpan/icmp.c
@@ -605,8 +605,6 @@ void icmpv6_send_router_adv(ipv6_addr_t *addr, uint8_t sllao, uint8_t mtu, uint8
         else {
             lowpan_context_t c_tmp[NDP_6LOWPAN_CONTEXT_MAX];
 
-            contexts_len = 0;
-
             for (int i = 0; i < NDP_6LOWPAN_CONTEXT_MAX; i++) {
                 lowpan_context_t *ctx = abr_get_context(msg_abr, i);