diff --git a/sys/netinet/ip_ecn.h b/sys/netinet/ip_ecn.h
--- a/sys/netinet/ip_ecn.h
+++ b/sys/netinet/ip_ecn.h
@@ -50,6 +50,6 @@
 #define ECN_WARN	2	/* caller MAY log */
 #define ECN_ALARM	3	/* caller SHOULD log and MAY raise alarm */
 
-extern void ip_ecn_ingress(int, u_int8_t *, const u_int8_t *);
-extern int ip_ecn_egress(int, const u_int8_t *, u_int8_t *);
+extern void ip_ecn_ingress(int, uint8_t *, const uint8_t *);
+extern int ip_ecn_egress(int, const uint8_t *, uint8_t *);
 #endif
diff --git a/sys/netinet/ip_ecn.c b/sys/netinet/ip_ecn.c
--- a/sys/netinet/ip_ecn.c
+++ b/sys/netinet/ip_ecn.c
@@ -112,7 +112,7 @@
  * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
  */
 void
-ip_ecn_ingress(int mode, u_int8_t *outer, const u_int8_t *inner)
+ip_ecn_ingress(int mode, uint8_t *outer, const uint8_t *inner)
 {
 
 	if (!outer || !inner)
@@ -140,7 +140,7 @@
  * the caller should drop the packet if the return value is 0.
  */
 int
-ip_ecn_egress(int mode, const u_int8_t *outer, u_int8_t *inner)
+ip_ecn_egress(int mode, const uint8_t *outer, uint8_t *inner)
 {
 
 	if (!outer || !inner)
@@ -198,9 +198,9 @@
 
 #ifdef INET6
 void
-ip6_ecn_ingress(int mode, u_int32_t *outer, const u_int32_t *inner)
+ip6_ecn_ingress(int mode, uint32_t *outer, const uint32_t *inner)
 {
-	u_int8_t outer8, inner8;
+	uint8_t outer8, inner8;
 
 	if (!outer || !inner)
 		panic("NULL pointer passed to ip6_ecn_ingress");
@@ -208,13 +208,13 @@
 	inner8 = (ntohl(*inner) >> IPV6_FLOWLABEL_LEN) & 0xff;
 	ip_ecn_ingress(mode, &outer8, &inner8);
 	*outer &= ~htonl(0xff << IPV6_FLOWLABEL_LEN);
-	*outer |= htonl((u_int32_t)outer8 << IPV6_FLOWLABEL_LEN);
+	*outer |= htonl((uint32_t)outer8 << IPV6_FLOWLABEL_LEN);
 }
 
 int
-ip6_ecn_egress(int mode, const u_int32_t *outer, u_int32_t *inner)
+ip6_ecn_egress(int mode, const uint32_t *outer, uint32_t *inner)
 {
-	u_int8_t outer8, inner8, oinner8;
+	uint8_t outer8, inner8, oinner8;
 	int ret;
 
 	if (!outer || !inner)
@@ -228,7 +228,7 @@
 		return (ECN_DROP);
 	if (inner8 != oinner8) {
 		*inner &= ~htonl(0xff << IPV6_FLOWLABEL_LEN);
-		*inner |= htonl((u_int32_t)inner8 << IPV6_FLOWLABEL_LEN);
+		*inner |= htonl((uint32_t)inner8 << IPV6_FLOWLABEL_LEN);
 	}
 	return (ret);
 }
diff --git a/sys/netinet6/ip6_ecn.h b/sys/netinet6/ip6_ecn.h
--- a/sys/netinet6/ip6_ecn.h
+++ b/sys/netinet6/ip6_ecn.h
@@ -32,6 +32,6 @@
  */
 
 #ifdef _KERNEL
-extern void ip6_ecn_ingress(int, u_int32_t *, const u_int32_t *);
-extern int ip6_ecn_egress(int, const u_int32_t *, u_int32_t *);
+extern void ip6_ecn_ingress(int, uint32_t *, const uint32_t *);
+extern int ip6_ecn_egress(int, const uint32_t *, uint32_t *);
 #endif