diff --git a/CHANGES b/CHANGES
index 894647d993..ea2ef1214d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -9,7 +9,8 @@
 			xfrout_ctx_destroy() being called with a
 			partially initaliased structure.
 			
-1603.	[placeholder]	rt10929.
+1603.	[bug]		nsupdate: set interactive based on isatty().
+			[RT# 10929]
 
 1602.	[placeholder]	rt10925.
 
diff --git a/bin/nsupdate/nsupdate.c b/bin/nsupdate/nsupdate.c
index 3afcb65087..46d36097a5 100644
--- a/bin/nsupdate/nsupdate.c
+++ b/bin/nsupdate/nsupdate.c
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: nsupdate.c,v 1.130 2004/03/05 04:58:15 marka Exp $ */
+/* $Id: nsupdate.c,v 1.131 2004/04/10 04:03:16 marka Exp $ */
 
 #include <config.h>
 
@@ -1953,6 +1953,8 @@ main(int argc, char **argv) {
 
 	input = stdin;
 
+	interactive = ISC_TF(isatty(0));
+
 	isc_app_start();
 
 	parse_args(argc, argv);
diff --git a/config.h.win32 b/config.h.win32
index b6b1f7c38d..152f4f893b 100644
--- a/config.h.win32
+++ b/config.h.win32
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: config.h.win32,v 1.8 2004/03/16 05:22:15 marka Exp $ */
+/* $Id: config.h.win32,v 1.9 2004/04/10 04:03:16 marka Exp $ */
 
 /*
  * win32 configuration file
@@ -192,6 +192,7 @@ typedef long off_t;
 #define open	_open
 #define close	_close
 #define write	_write
+#define isatty	_isatty
 
 #ifndef _WINSOCKAPI_
 #define _WINSOCKAPI_   /* Prevent inclusion of winsock.h in windows.h */