diff --git a/tests/sys/cddl/zfs/bin/readmmap.c b/tests/sys/cddl/zfs/bin/readmmap.c
index d2dd5605351d..c21697798285 100644
--- a/tests/sys/cddl/zfs/bin/readmmap.c
+++ b/tests/sys/cddl/zfs/bin/readmmap.c
@@ -1,140 +1,141 @@
 /*
  * CDDL HEADER START
  *
  * The contents of this file are subject to the terms of the
  * Common Development and Distribution License (the "License").
  * You may not use this file except in compliance with the License.
  *
  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  * or http://www.opensolaris.org/os/licensing.
  * See the License for the specific language governing permissions
  * and limitations under the License.
  *
  * When distributing Covered Code, include this CDDL HEADER in each
  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  * If applicable, add the following below this CDDL HEADER, with the
  * fields enclosed by brackets "[]" replaced with your own identifying
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  * $FreeBSD$
  */
 
 /*
  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
 #pragma ident	"@(#)readmmap.c	1.4	07/05/25 SMI"
 
 /*
  * --------------------------------------------------------------
  *	BugId 5047993 : Getting bad read data.
  *
  *	Usage: readmmap <filename>
  *
  *	where:
  *		filename is an absolute path to the file name.
  *
  *	Return values:
  *		1 : error
  *		0 : no errors
  * --------------------------------------------------------------
  */
 #include <stdio.h>
 #include <stdlib.h>
+#include <time.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <sys/mman.h>
 
 int
 main(int argc, char **argv)
 {
 	char *filename = "badfile";
 	size_t size = 4395;
 	size_t idx = 0;
 	char *buf = NULL;
 	char *map = NULL;
 	int fd = -1, bytes, retval = 0;
 	unsigned seed;
 
 	if (argc < 2 || optind == argc) {
 		(void) fprintf(stderr,
 		    "usage: %s <file name>\n", argv[0]);
 		exit(1);
 	}
 
 	if ((buf = calloc(1, size)) == NULL) {
 		perror("calloc");
 		exit(1);
 	}
 
 	filename = argv[optind];
 
 	(void) remove(filename);
 
 	fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0666);
 	if (fd == -1) {
 		perror("open to create");
 		retval = 1;
 		goto end;
 	}
 
 	bytes = write(fd, buf, size);
 	if (bytes != size) {
 		(void) printf("short write: %d != %zu\n", bytes, size);
 		retval = 1;
 		goto end;
 	}
 
 	map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
 	if (map == MAP_FAILED) {
 		perror("mmap");
 		retval = 1;
 		goto end;
 	}
 	seed = time(NULL);
 	srandom(seed);
 
 	idx = random() % size;
 	map[idx] = 1;
 
 	if (msync(map, size, MS_SYNC) != 0) {
 		perror("msync");
 		retval = 1;
 		goto end;
 	}
 
 	if (munmap(map, size) != 0) {
 		perror("munmap");
 		retval = 1;
 		goto end;
 	}
 
 	bytes = pread(fd, buf, size, 0);
 	if (bytes != size) {
 		(void) printf("short read: %d != %zu\n", bytes, size);
 		retval = 1;
 		goto end;
 	}
 
 	if (buf[idx] != 1) {
 		(void) printf(
 		    "bad data from read!  got buf[%zu]=%d, expected 1\n",
 		    idx, buf[idx]);
 		retval = 1;
 		goto end;
 	}
 
 	(void) printf("good data from read: buf[%zu]=1\n", idx);
 end:
 	if (fd != -1) {
 		(void) close(fd);
 	}
 	if (buf != NULL) {
 		free(buf);
 	}
 
 	return (retval);
 }