diff --git a/Makefile.am b/Makefile.am
index 1685c3dc..ee9a8795 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -253,9 +253,6 @@ endif
 if NO_CFMAKERAW
 nodist_tmux_SOURCES += compat/cfmakeraw.c
 endif
-if NO_OPENAT
-nodist_tmux_SOURCES += compat/openat.c
-endif
 if NO_REALLOCARRAY
 nodist_tmux_SOURCES += compat/reallocarray.c
 endif
diff --git a/compat.h b/compat.h
index 12f99d13..f5275223 100644
--- a/compat.h
+++ b/compat.h
@@ -279,12 +279,6 @@ int		 unsetenv(const char *);
 void		 cfmakeraw(struct termios *);
 #endif
 
-#ifndef HAVE_OPENAT
-/* openat.c */
-#define AT_FDCWD -100
-int		 openat(int, const char *, int, ...);
-#endif
-
 #ifndef HAVE_REALLOCARRAY
 /* reallocarray.c */
 void		*reallocarray(void *, size_t, size_t);
diff --git a/compat/openat.c b/compat/openat.c
deleted file mode 100644
index d003e53d..00000000
--- a/compat/openat.c
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
- * Copyright (c) 2013 Nicholas Marriott <nicholas.marriott@gmail.com>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
- * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
- * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-#include <errno.h>
-#include <fcntl.h>
-#include <stdarg.h>
-#include <unistd.h>
-
-#include "tmux.h"
-
-int
-openat(int fd, const char *path, int flags, ...)
-{
-	mode_t	mode;
-	va_list ap;
-	int	dotfd, retval, saved_errno;
-
-	if (flags & O_CREAT) {
-		va_start(ap, flags);
-		mode = va_arg(ap, mode_t);
-		va_end(ap);
-	} else
-		mode = 0;
-
-	dotfd = -1;
-	if (fd != AT_FDCWD) {
-		dotfd = open(".", O_RDONLY);
-		if (dotfd == -1)
-			return (-1);
-		if (fchdir(fd) != 0) {
-			saved_errno = errno;
-			close(dotfd);
-			errno = saved_errno;
-			return (-1);
-		}
-	}
-
-	retval = open(path, flags, mode);
-
-	if (dotfd != -1) {
-		if (fchdir(dotfd) != 0) {
-			saved_errno = errno;
-			close(retval);
-			close(dotfd);
-			errno = saved_errno;
-			return (-1);
-		}
-		close(dotfd);
-	}
-
-	return (retval);
-}
diff --git a/configure.ac b/configure.ac
index c383e483..77c82d5e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -458,13 +458,6 @@ if test "x$found_cfmakeraw" = xyes; then
 fi
 AM_CONDITIONAL(NO_CFMAKERAW, [test "x$found_cfmakeraw" = xno])
 
-# Look for openat, compat/openat.c used if missing.
-AC_CHECK_FUNC(openat, found_openat=yes, found_openat=no)
-if test "x$found_openat" = xyes; then
-	AC_DEFINE(HAVE_OPENAT)
-fi
-AM_CONDITIONAL(NO_OPENAT, [test "x$found_openat" = xno])
-
 # Look for reallocarray, compat/reallocarray.c used if missing.
 AC_CHECK_FUNC(reallocarray, found_reallocarray=yes, found_reallocarray=no)
 if test "x$found_reallocarray" = xyes; then