diff --git a/CHANGES b/CHANGES
index 777214c527..87ea1b8649 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,5 @@
+2734.	[port]		cygwin: arpaname did not compile. [RT #20473]
+
 2733.	[cleanup]	Clean up coding style in pkcs11-* tools. [RT #20355]
 
 2732.	[func]		Add optional filter-aaaa-on-v4 option, available
diff --git a/bin/tools/arpaname.c b/bin/tools/arpaname.c
index 12c4fe9445..356a883a45 100644
--- a/bin/tools/arpaname.c
+++ b/bin/tools/arpaname.c
@@ -14,14 +14,12 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: arpaname.c,v 1.3 2009/06/18 16:02:25 each Exp $ */
+/* $Id: arpaname.c,v 1.4 2009/10/27 03:05:33 marka Exp $ */
 
 #include "config.h"
 
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
+#include <isc/net.h>
+
 #include <stdio.h>
 
 #define UNUSED(x) (void)(x)