diff --git a/include/linux/pfkeyv2.h b/include/linux/pfkeyv2.h
index 0f0b880..265bafa 100644
--- a/include/linux/pfkeyv2.h
+++ b/include/linux/pfkeyv2.h
@@ -285,6 +285,7 @@
 #define SADB_X_AALG_SHA2_384HMAC	6
 #define SADB_X_AALG_SHA2_512HMAC	7
 #define SADB_X_AALG_RIPEMD160HMAC	8
+#define SADB_X_AALG_AES_XCBC_MAC	9
 #define SADB_X_AALG_NULL		251	/* kame */
 #define SADB_AALG_MAX			251