diff --git a/lib/krb5/krb5.h b/lib/krb5/krb5.h
index 9c0f56694..6d63cd26c 100644
--- a/lib/krb5/krb5.h
+++ b/lib/krb5/krb5.h
@@ -274,6 +274,10 @@ typedef enum krb5_key_usage {
     /* Encryption type of the kdc session contribution in pk-init */
     KRB5_KU_AS_REQ = 56,
     /* Checksum of over the AS-REQ send by the KDC in PA-REQ-ENC-PA-REP */
+    KRB5_KU_FAST_REQ_CHKSUM = 50,
+    /* FAST armor checksum */
+    KRB5_KU_FAST_ENC = 51,
+    /* FAST armor encryption */
     KRB5_KU_DIGEST_ENCRYPT = -18,
     /* Encryption key usage used in the digest encryption field */
     KRB5_KU_DIGEST_OPAQUE = -19,