diff --git a/sunrpc/rpc/xdr.h b/sunrpc/rpc/xdr.h
index e54df5a1fd..c387741cd9 100644
--- a/sunrpc/rpc/xdr.h
+++ b/sunrpc/rpc/xdr.h
@@ -253,7 +253,7 @@ extern bool_t	xdr_vector __P ((XDR *__xdrs, char *__basep, u_int __nelem,
 				 u_int __elemsize, xdrproc_t __xdr_elem));
 extern bool_t	xdr_float __P ((XDR *__xdrs, float *__fp));
 extern bool_t	xdr_double __P ((XDR *__xdrs, double *__dp));
-extern bool_t	xdr_reference __P ((XDR *__xdrs, caddr_t *__pp, u_int __size,
+extern bool_t	xdr_reference __P ((XDR *__xdrs, caddr_t *__xpp, u_int __size,
 				    xdrproc_t __proc));
 extern bool_t	xdr_pointer __P ((XDR *__xdrs, char **__objpp,
 				  u_int __obj_size, xdrproc_t __xdr_obj));
@@ -278,11 +278,11 @@ extern bool_t   xdr_netobj __P ((XDR *__xdrs, struct netobj *__np));
 
 /* XDR using memory buffers */
 extern void   xdrmem_create __P ((XDR *__xdrs, caddr_t __addr, u_int __size,
-				  enum xdr_op __op));
+				  enum xdr_op __xop));
 
 /* XDR using stdio library */
 extern void   xdrstdio_create __P ((XDR *__xdrs, FILE *__file,
-				    enum xdr_op __op));
+				    enum xdr_op __xop));
 
 /* XDR pseudo records for tcp */
 extern void   xdrrec_create __P ((XDR *__xdrs, u_int __sendsize,