diff --git a/pass-1/packet.h b/pass-1/packet.h
index 824594b..e6de28a 100644
--- a/pass-1/packet.h
+++ b/pass-1/packet.h
@@ -5,7 +5,7 @@
 #include <netinet/ip.h>
 #include <netinet/ip6.h>
 
-#define IPPROTO_HIDE_EID 0xfd
+#define IPPROTO_HIDE_EID 99
 
 
 struct packet {
@@ -45,4 +45,4 @@ int wrap_ipv6_packet(struct rlocs* reg, struct recv_pkt* pkt, struct rsp_data* o
 
 int unwrap_ipv4_packet(struct rlocs* reg, struct recv_pkt* pkt, struct rsp_data* out);
 int unwrap_ipv6_packet(struct rlocs* reg, struct recv_pkt* pkt, struct rsp_data* out);
-#endif
\ No newline at end of file
+#endif