diff --git a/ChangeLog b/ChangeLog
index 704668e2a..a51117c88 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -8,6 +8,8 @@
    - markus@cvs.openbsd.org 2006/09/19 21:14:08
      [packet.c]
      client NULL deref on protocol error; Tavis Ormandy, Google Security Team
+ - (dtucker) [defines.h] Include unistd.h before defining getpgrp; fixes
+   build error on Ultrix.  From Bernhard Simon.
 
 20060918
  - (dtucker) [configure.ac] On AIX, check to see if the compiler will allow
@@ -5468,4 +5470,4 @@
    - (djm) Trim deprecated options from INSTALL. Mention UsePAM
    - (djm) Fix quote handling in sftp; Patch from admorten AT umich.edu
 
-$Id: ChangeLog,v 1.4554 2006/09/21 03:00:25 dtucker Exp $
+$Id: ChangeLog,v 1.4555 2006/09/21 13:13:30 dtucker Exp $
diff --git a/defines.h b/defines.h
index 6b395f806..8a4e2c73e 100644
--- a/defines.h
+++ b/defines.h
@@ -25,7 +25,7 @@
 #ifndef _DEFINES_H
 #define _DEFINES_H
 
-/* $Id: defines.h,v 1.137 2006/08/18 22:38:24 djm Exp $ */
+/* $Id: defines.h,v 1.138 2006/09/21 13:13:30 dtucker Exp $ */
 
 
 /* Constants */
@@ -556,6 +556,7 @@ struct winsize {
 #endif /* defined(HAVE_VHANGUP) && !defined(HAVE_DEV_PTMX) */
 
 #ifndef GETPGRP_VOID
+# include <unistd.h>
 # define getpgrp() getpgrp(0)
 #endif