diff --git a/sys/net/routing/rpl/rpl_control_messages.c b/sys/net/routing/rpl/rpl_control_messages.c
index 4f411a9e55..68d13906b2 100644
--- a/sys/net/routing/rpl/rpl_control_messages.c
+++ b/sys/net/routing/rpl/rpl_control_messages.c
@@ -160,7 +160,7 @@ static rpl_dao_t *get_rpl_dao_buf(void)
 
 static rpl_dao_ack_t *get_rpl_dao_ack_buf(void)
 {
-    return ((rpl_dao_ack_t *) & (buffer[(LL_HDR_LEN + IPV6_HDR_LEN + ICMPV6_HDR_LEN)]));
+    return ((rpl_dao_ack_t *) & (sixlowpan_buffer[(LL_HDR_LEN + IPV6_HDR_LEN + ICMPV6_HDR_LEN)]));
 }
 
 static rpl_dis_t *get_rpl_dis_buf(void)