diff --git a/bin/ksh/config.h b/bin/ksh/config.h
index 1f9aadf001e2..bea9f4481659 100644
--- a/bin/ksh/config.h
+++ b/bin/ksh/config.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: config.h,v 1.18 2017/06/22 23:11:48 kamil Exp $	*/
+/*	$NetBSD: config.h,v 1.19 2017/06/22 23:15:05 kamil Exp $	*/
 
 /* config.h.  Generated automatically by configure.  */
 /* config.h.in.  Generated automatically from configure.in by autoheader.  */
@@ -23,9 +23,6 @@
 /* Define if you have <sys/wait.h> that is POSIX.1 compatible.  */
 #define HAVE_SYS_WAIT_H 1
 
-/* Define if you have <unistd.h>.  */
-#define HAVE_UNISTD_H 1
-
 /* Define if on MINIX.  */
 /* #undef _MINIX */
 
diff --git a/bin/ksh/sh.h b/bin/ksh/sh.h
index f03a579bb91d..7517c8bfe10e 100644
--- a/bin/ksh/sh.h
+++ b/bin/ksh/sh.h
@@ -1,10 +1,10 @@
-/*	$NetBSD: sh.h,v 1.12 2017/06/22 14:20:46 kamil Exp $	*/
+/*	$NetBSD: sh.h,v 1.13 2017/06/22 23:15:05 kamil Exp $	*/
 
 /*
  * Public Domain Bourne/Korn shell
  */
 
-/* $Id: sh.h,v 1.12 2017/06/22 14:20:46 kamil Exp $ */
+/* $Id: sh.h,v 1.13 2017/06/22 23:15:05 kamil Exp $ */
 
 #include "config.h"	/* system and option configuration info */
 
@@ -37,45 +37,7 @@ extern void   srand   ARGS((unsigned int));
 extern int    atoi    ARGS((const char *));
 #endif /* HAVE_STDLIB_H */
 
-#ifdef HAVE_UNISTD_H
-# include <unistd.h>
-#else
-/* just a useful subset of what unistd.h would have */
-extern int access ARGS((const char *, int));
-extern int open ARGS((const char *, int, ...));
-extern int creat ARGS((const char *, mode_t));
-extern int read ARGS((int, char *, unsigned));
-extern int write ARGS((int, const char *, unsigned));
-extern off_t lseek ARGS((int, off_t, int));
-extern int close ARGS((int));
-extern int pipe ARGS((int []));
-extern int dup2 ARGS((int, int));
-extern int unlink ARGS((const char *));
-extern int fork ARGS((void));
-extern int execve ARGS((const char *, char * const[], char * const[]));
-extern int chdir ARGS((const char *));
-extern int kill ARGS((pid_t, int));
-extern char *getcwd();	/* no ARGS here - differs on different machines */
-extern int geteuid ARGS((void));
-extern int readlink ARGS((const char *, char *, int));
-extern int getegid ARGS((void));
-extern int getpid ARGS((void));
-extern int getppid ARGS((void));
-extern unsigned int sleep ARGS((unsigned int));
-extern int isatty ARGS((int));
-# ifdef POSIX_PGRP
-extern int getpgrp ARGS((void));
-extern int setpgid ARGS((pid_t, pid_t));
-# endif /* POSIX_PGRP */
-# ifdef BSD_PGRP
-extern int getpgrp ARGS((pid_t));
-extern int setpgrp ARGS((pid_t, pid_t));
-# endif /* BSD_PGRP */
-# ifdef SYSV_PGRP
-extern int getpgrp ARGS((void));
-extern int setpgrp ARGS((void));
-# endif /* SYSV_PGRP */
-#endif /* HAVE_UNISTD_H */
+#include <unistd.h>
 
 #ifdef HAVE_STRING_H
 # include <string.h>