diff --git a/src/udp.c b/src/udp.c
index bbaff41..119e777 100644
--- a/src/udp.c
+++ b/src/udp.c
@@ -184,7 +184,7 @@ int udp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
 	}
 
 	/* allocate memory for translated packet */
-	packet_size = sizeof(struct s_ipv4) + ip6->len;
+	packet_size = sizeof(struct s_ipv4) + htons(ip6->len);
 	if ((packet = (unsigned char *) malloc(packet_size)) == NULL) {
 		fprintf(stderr, "[Error] Lack of free memory\n");
 		return 1;