diff --git a/include/rpc/xdr.h b/include/rpc/xdr.h
--- a/include/rpc/xdr.h
+++ b/include/rpc/xdr.h
@@ -278,7 +278,7 @@
  * These are the "generic" xdr routines.
  */
 __BEGIN_DECLS
-extern bool_t	xdr_void(void);
+extern bool_t	xdr_void(XDR *, void *);
 extern bool_t	xdr_int(XDR *, int *);
 extern bool_t	xdr_u_int(XDR *, u_int *);
 extern bool_t	xdr_long(XDR *, long *);
diff --git a/lib/libc/xdr/xdr.c b/lib/libc/xdr/xdr.c
--- a/lib/libc/xdr/xdr.c
+++ b/lib/libc/xdr/xdr.c
@@ -84,13 +84,11 @@
  * XDR nothing
  */
 bool_t
-xdr_void(void)
+xdr_void(XDR *xdrs __unused, void *ptr __unused)
 {
-
 	return (TRUE);
 }
 
-
 /*
  * XDR integers
  */
diff --git a/sys/rpc/xdr.h b/sys/rpc/xdr.h
--- a/sys/rpc/xdr.h
+++ b/sys/rpc/xdr.h
@@ -285,7 +285,7 @@
  * These are the "generic" xdr routines.
  */
 __BEGIN_DECLS
-extern bool_t	xdr_void(void);
+extern bool_t	xdr_void(XDR *, void *);
 extern bool_t	xdr_int(XDR *, int *);
 extern bool_t	xdr_u_int(XDR *, u_int *);
 extern bool_t	xdr_long(XDR *, long *);
diff --git a/sys/xdr/xdr.c b/sys/xdr/xdr.c
--- a/sys/xdr/xdr.c
+++ b/sys/xdr/xdr.c
@@ -84,9 +84,8 @@
  * XDR nothing
  */
 bool_t
-xdr_void(void)
+xdr_void(XDR *xrds __unused, void *ptr __unused)
 {
-
 	return (TRUE);
 }