diff --git a/lib/krb5/krb5_locl.h b/lib/krb5/krb5_locl.h
index 3fd8498b0..3309bb357 100644
--- a/lib/krb5/krb5_locl.h
+++ b/lib/krb5/krb5_locl.h
@@ -151,6 +151,7 @@ struct sockaddr_dl;
 struct send_to_kdc;
 
 /* XXX glue for pkinit */
+struct hx509_certs_data;
 struct krb5_pk_identity;
 struct krb5_pk_cert;
 struct ContentInfo;