diff --git a/dist/ntp/ntpd/ntp_io.c b/dist/ntp/ntpd/ntp_io.c
index 2cc1a7c77ef4..92cccc5b3c51 100644
--- a/dist/ntp/ntpd/ntp_io.c
+++ b/dist/ntp/ntpd/ntp_io.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: ntp_io.c,v 1.12 2005/06/03 16:13:33 lukem Exp $	*/
+/*	$NetBSD: ntp_io.c,v 1.13 2006/03/18 13:13:25 kardel Exp $	*/
 
 /*
  * ntp_io.c - input/output routines for ntpd.	The socket-opening code
@@ -1273,6 +1273,9 @@ close_socket(
 {
 	SOCKET i, newmax;
 
+	if (fd == INVALID_SOCKET)
+		return;
+
 	(void) closesocket(fd);
 
 	/*
@@ -1306,6 +1309,9 @@ close_file(
 {
 	int i, newmax;
 
+	if (fd == INVALID_SOCKET)
+		return;
+
 	(void) close(fd);
 	/*
 	 * I/O Completion Ports don't care about select and fd_set