diff --git a/Kernel/API/POSIX/sys/socket.h b/Kernel/API/POSIX/sys/socket.h
index a945dcabeca..f1c771b575a 100644
--- a/Kernel/API/POSIX/sys/socket.h
+++ b/Kernel/API/POSIX/sys/socket.h
@@ -48,6 +48,8 @@ extern "C" {
 #define IPPROTO_TCP 6
 #define IPPROTO_UDP 17
 #define IPPROTO_IPV6 41
+#define IPPROTO_ESP 50
+#define IPPROTO_AH 51
 #define IPPROTO_ICMPV6 58
 #define IPPROTO_RAW 255