diff --git a/lib/krb5/keytab_krb4.c b/lib/krb5/keytab_krb4.c
index c6dee3e5c..84431db18 100644
--- a/lib/krb5/keytab_krb4.c
+++ b/lib/krb5/keytab_krb4.c
@@ -32,7 +32,6 @@
  */
 
 #include "krb5_locl.h"
-#include <krb.h>
 
 RCSID("$Id$");
 
@@ -227,6 +226,9 @@ krb4_kt_add_entry (krb5_context context,
     struct krb4_kt_data *d = id->data;
     krb5_error_code ret;
     int fd;
+#define ANAME_SZ 40
+#define INST_SZ 40
+#define REALM_SZ 40
     char service[ANAME_SZ];
     char instance[INST_SZ];
     char realm[REALM_SZ];
@@ -258,7 +260,7 @@ krb4_kt_add_entry (krb5_context context,
     return 0;
 }
 
-krb5_kt_ops krb4_fkt_ops = {
+const krb5_kt_ops krb4_fkt_ops = {
     "krb4",
     krb4_kt_resolve,
     krb4_kt_get_name,