diff --git a/sys/compat/linuxkpi/common/include/linux/ip.h b/sys/compat/linuxkpi/common/include/linux/ip.h
index 3507c6fe9b97..894e081b14ab 100644
--- a/sys/compat/linuxkpi/common/include/linux/ip.h
+++ b/sys/compat/linuxkpi/common/include/linux/ip.h
@@ -1,74 +1,75 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause
  *
  * Copyright (c) 2020-2021 The FreeBSD Foundation
  *
  * This software was developed by Björn Zeeb under sponsorship from
  * the FreeBSD Foundation.
  *
  * 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.
  *
  * $FreeBSD$
  */
 
 #ifndef	__LKPI_LINUX_IP_H
 #define	__LKPI_LINUX_IP_H
 
 #include <sys/types.h>
 
+#include <netinet/in.h>
 #include <netinet/ip.h>
 #include <machine/in_cksum.h>
 
 #include <linux/skbuff.h>
 
 /* (u) unconfirmed structure field names; using FreeBSD's meanwhile. */
 struct iphdr {
 	uint8_t		ip_hl:4, ip_ver:4;	/* (u) */
 	uint8_t		ip_tos;			/* (u) */
 	uint16_t	ip_len;			/* (u) */
 	uint16_t	id;
 	uint16_t	ip_off;			/* (u) */
 	uint8_t		ip_ttl;			/* (u) */
 	uint8_t		protocol;
 	uint16_t	check;
 	uint32_t	saddr;
 	uint32_t	daddr;
 };
 
 static __inline struct iphdr *
 ip_hdr(struct sk_buff *skb)
 {
 
 	return (struct iphdr *)skb_network_header(skb);
 }
 
 static __inline void
 ip_send_check(struct iphdr *iph)
 {
 
 	/* Clear the checksum before computing! */
 	iph->check = 0;
 	/* An IPv4 header is the same everywhere even if names differ. */
 	iph->check = in_cksum_hdr((const void *)iph);
 }
 
 #endif	/* __LKPI_LINUX_IP_H */