diff --git a/lib/libutil/kinfo_getproc.c b/lib/libutil/kinfo_getproc.c
index 4d16b1c16a13..e34fdbdf18e8 100644
--- a/lib/libutil/kinfo_getproc.c
+++ b/lib/libutil/kinfo_getproc.c
@@ -1,73 +1,71 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
  *
  * Copyright (c) 2009 Ulf Lilleengen
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
  * $FreeBSD$
  */
 
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
 #include <sys/sysctl.h>
 #include <sys/user.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "libutil.h"
 
 struct kinfo_proc *
 kinfo_getproc(pid_t pid)
 {
 	struct kinfo_proc *kipp;
 	int mib[4];
 	size_t len;
 
-	len = 0;
+	len = sizeof(*kipp);
+	kipp = malloc(len);
+	if (kipp == NULL)
+		return (NULL);
+
 	mib[0] = CTL_KERN;
 	mib[1] = KERN_PROC;
 	mib[2] = KERN_PROC_PID;
 	mib[3] = pid;
-	if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) < 0)
-		return (NULL);
-
-	kipp = malloc(len);
-	if (kipp == NULL)
-		return (NULL);
 
 	if (sysctl(mib, nitems(mib), kipp, &len, NULL, 0) < 0)
 		goto bad;
 	if (len != sizeof(*kipp))
 		goto bad;
 	if (kipp->ki_structsize != sizeof(*kipp))
 		goto bad;
 	if (kipp->ki_pid != pid)
 		goto bad;
 	return (kipp);
 bad:
 	free(kipp);
 	return (NULL);
 }