diff --git a/lib/krb5/krb5.h b/lib/krb5/krb5.h
index 97deb7981..d53dc6a68 100644
--- a/lib/krb5/krb5.h
+++ b/lib/krb5/krb5.h
@@ -200,6 +200,7 @@ typedef union {
 
 /* constants for compare_creds (and cc_retrieve_cred) */
 #define KRB5_TC_DONT_MATCH_REALM	(1 << 31)
+#define KRB5_TC_MATCH_KEYTYPE		(1 << 30)
 
 typedef struct krb5_creds {
     krb5_principal client;