diff --git a/lib/gssapi/gssapi/gssapi_krb5.h b/lib/gssapi/gssapi/gssapi_krb5.h
index a02b6328c..a0aae0ebb 100644
--- a/lib/gssapi/gssapi/gssapi_krb5.h
+++ b/lib/gssapi/gssapi/gssapi_krb5.h
@@ -129,6 +129,9 @@ struct gsskrb5_send_to_kdc {
 OM_uint32
 gsskrb5_set_send_to_kdc(struct gsskrb5_send_to_kdc *);
 
+OM_uint32
+gsskrb5_set_default_realm(const char *);
+
 OM_uint32
 gsskrb5_extract_authtime_from_sec_context(OM_uint32 *, gss_ctx_id_t, time_t *);