diff --git a/winsup/cygserver/ChangeLog b/winsup/cygserver/ChangeLog
index 8233ce0d8..5ce462852 100644
--- a/winsup/cygserver/ChangeLog
+++ b/winsup/cygserver/ChangeLog
@@ -1,3 +1,7 @@
+2010-04-19  Christopher Faylor  <me+cygwin@cgf.cx>
+
+	* transport_pipes.cc: Include ntdef.h to accommodate cygerrno.h.
+
 2009-11-16  Corinna Vinschen  <corinna@vinschen.de>
 
 	* Makefile.in (cygserver.exe): Link with -static to avoid linking
diff --git a/winsup/cygserver/transport_pipes.cc b/winsup/cygserver/transport_pipes.cc
index b3aaae59d..87a91db42 100644
--- a/winsup/cygserver/transport_pipes.cc
+++ b/winsup/cygserver/transport_pipes.cc
@@ -13,6 +13,7 @@ details. */
 /* to allow this to link into cygwin and the .dll, a little magic is needed. */
 #ifdef __OUTSIDE_CYGWIN__
 #include "woutsup.h"
+#include <ntdef.h>
 #else
 #include "winsup.h"
 #endif