diff --git a/ipv4/control_pktinfo.go b/ipv4/control_pktinfo.go
index b0a8dbe..0e748db 100644
--- a/ipv4/control_pktinfo.go
+++ b/ipv4/control_pktinfo.go
@@ -13,11 +13,13 @@
 
 	"golang.org/x/net/internal/iana"
 	"golang.org/x/net/internal/socket"
+
+	"golang.org/x/sys/unix"
 )
 
 func marshalPacketInfo(b []byte, cm *ControlMessage) []byte {
 	m := socket.ControlMessage(b)
-	m.MarshalHeader(iana.ProtocolIP, sysIP_PKTINFO, sizeofInetPktinfo)
+	m.MarshalHeader(iana.ProtocolIP, unix.IP_PKTINFO, sizeofInetPktinfo)
 	if cm != nil {
 		pi := (*inetPktinfo)(unsafe.Pointer(&m.Data(sizeofInetPktinfo)[0]))
 		if ip := cm.Src.To4(); ip != nil {
diff --git a/ipv4/defs_darwin.go b/ipv4/defs_darwin.go
index 9c68276..162f310 100644
--- a/ipv4/defs_darwin.go
+++ b/ipv4/defs_darwin.go
@@ -20,7 +20,6 @@
 	sysIP_RECVDSTADDR = C.IP_RECVDSTADDR
 	sysIP_RECVIF      = C.IP_RECVIF
 	sysIP_RECVTTL     = C.IP_RECVTTL
-	sysIP_PKTINFO     = C.IP_PKTINFO
 
 	sizeofSockaddrStorage = C.sizeof_struct_sockaddr_storage
 	sizeofSockaddrInet    = C.sizeof_struct_sockaddr_in
diff --git a/ipv4/defs_linux.go b/ipv4/defs_linux.go
index c176850..31bdd60 100644
--- a/ipv4/defs_linux.go
+++ b/ipv4/defs_linux.go
@@ -21,7 +21,6 @@
 import "C"
 
 const (
-	sysIP_PKTINFO = C.IP_PKTINFO
 	sysIP_RECVTTL = C.IP_RECVTTL
 
 	sizeofKernelSockaddrStorage = C.sizeof_struct___kernel_sockaddr_storage
diff --git a/ipv4/defs_solaris.go b/ipv4/defs_solaris.go
index dcf1f6c..daf74e5 100644
--- a/ipv4/defs_solaris.go
+++ b/ipv4/defs_solaris.go
@@ -21,8 +21,6 @@
 	sysIP_RECVIF      = C.IP_RECVIF
 	sysIP_RECVTTL     = C.IP_RECVTTL
 
-	sysIP_PKTINFO = C.IP_PKTINFO
-
 	sizeofSockaddrStorage = C.sizeof_struct_sockaddr_storage
 	sizeofSockaddrInet    = C.sizeof_struct_sockaddr_in
 	sizeofInetPktinfo     = C.sizeof_struct_in_pktinfo
diff --git a/ipv4/zsys_darwin.go b/ipv4/zsys_darwin.go
index 345932b..d14b871 100644
--- a/ipv4/zsys_darwin.go
+++ b/ipv4/zsys_darwin.go
@@ -7,7 +7,6 @@
 	sysIP_RECVDSTADDR = 0x7
 	sysIP_RECVIF      = 0x14
 	sysIP_RECVTTL     = 0x18
-	sysIP_PKTINFO     = 0x1a
 
 	sizeofSockaddrStorage = 0x80
 	sizeofSockaddrInet    = 0x10
diff --git a/ipv4/zsys_linux_386.go b/ipv4/zsys_linux_386.go
index a1cbb95..8c5795e 100644
--- a/ipv4/zsys_linux_386.go
+++ b/ipv4/zsys_linux_386.go
@@ -4,7 +4,6 @@
 package ipv4
 
 const (
-	sysIP_PKTINFO = 0x8
 	sysIP_RECVTTL = 0xc
 
 	sizeofKernelSockaddrStorage = 0x80
diff --git a/ipv4/zsys_linux_amd64.go b/ipv4/zsys_linux_amd64.go
index fcf9fa2..7b40aa1 100644
--- a/ipv4/zsys_linux_amd64.go
+++ b/ipv4/zsys_linux_amd64.go
@@ -4,7 +4,6 @@
 package ipv4
 
 const (
-	sysIP_PKTINFO = 0x8
 	sysIP_RECVTTL = 0xc
 
 	sizeofKernelSockaddrStorage = 0x80
diff --git a/ipv4/zsys_linux_arm.go b/ipv4/zsys_linux_arm.go
index a1cbb95..8c5795e 100644
--- a/ipv4/zsys_linux_arm.go
+++ b/ipv4/zsys_linux_arm.go
@@ -4,7 +4,6 @@
 package ipv4
 
 const (
-	sysIP_PKTINFO = 0x8
 	sysIP_RECVTTL = 0xc
 
 	sizeofKernelSockaddrStorage = 0x80
diff --git a/ipv4/zsys_linux_arm64.go b/ipv4/zsys_linux_arm64.go
index fcf9fa2..7b40aa1 100644
--- a/ipv4/zsys_linux_arm64.go
+++ b/ipv4/zsys_linux_arm64.go
@@ -4,7 +4,6 @@
 package ipv4
 
 const (
-	sysIP_PKTINFO = 0x8
 	sysIP_RECVTTL = 0xc
 
 	sizeofKernelSockaddrStorage = 0x80
diff --git a/ipv4/zsys_linux_mips.go b/ipv4/zsys_linux_mips.go
index a1cbb95..8c5795e 100644
--- a/ipv4/zsys_linux_mips.go
+++ b/ipv4/zsys_linux_mips.go
@@ -4,7 +4,6 @@
 package ipv4
 
 const (
-	sysIP_PKTINFO = 0x8
 	sysIP_RECVTTL = 0xc
 
 	sizeofKernelSockaddrStorage = 0x80
diff --git a/ipv4/zsys_linux_mips64.go b/ipv4/zsys_linux_mips64.go
index fcf9fa2..7b40aa1 100644
--- a/ipv4/zsys_linux_mips64.go
+++ b/ipv4/zsys_linux_mips64.go
@@ -4,7 +4,6 @@
 package ipv4
 
 const (
-	sysIP_PKTINFO = 0x8
 	sysIP_RECVTTL = 0xc
 
 	sizeofKernelSockaddrStorage = 0x80
diff --git a/ipv4/zsys_linux_mips64le.go b/ipv4/zsys_linux_mips64le.go
index fcf9fa2..7b40aa1 100644
--- a/ipv4/zsys_linux_mips64le.go
+++ b/ipv4/zsys_linux_mips64le.go
@@ -4,7 +4,6 @@
 package ipv4
 
 const (
-	sysIP_PKTINFO = 0x8
 	sysIP_RECVTTL = 0xc
 
 	sizeofKernelSockaddrStorage = 0x80
diff --git a/ipv4/zsys_linux_mipsle.go b/ipv4/zsys_linux_mipsle.go
index a1cbb95..8c5795e 100644
--- a/ipv4/zsys_linux_mipsle.go
+++ b/ipv4/zsys_linux_mipsle.go
@@ -4,7 +4,6 @@
 package ipv4
 
 const (
-	sysIP_PKTINFO = 0x8
 	sysIP_RECVTTL = 0xc
 
 	sizeofKernelSockaddrStorage = 0x80
diff --git a/ipv4/zsys_linux_ppc.go b/ipv4/zsys_linux_ppc.go
index 714ae0a..2c9e7e3 100644
--- a/ipv4/zsys_linux_ppc.go
+++ b/ipv4/zsys_linux_ppc.go
@@ -4,7 +4,6 @@
 package ipv4
 
 const (
-	sysIP_PKTINFO = 0x8
 	sysIP_RECVTTL = 0xc
 
 	sizeofKernelSockaddrStorage = 0x80
diff --git a/ipv4/zsys_linux_ppc64.go b/ipv4/zsys_linux_ppc64.go
index fcf9fa2..7b40aa1 100644
--- a/ipv4/zsys_linux_ppc64.go
+++ b/ipv4/zsys_linux_ppc64.go
@@ -4,7 +4,6 @@
 package ipv4
 
 const (
-	sysIP_PKTINFO = 0x8
 	sysIP_RECVTTL = 0xc
 
 	sizeofKernelSockaddrStorage = 0x80
diff --git a/ipv4/zsys_linux_ppc64le.go b/ipv4/zsys_linux_ppc64le.go
index fcf9fa2..7b40aa1 100644
--- a/ipv4/zsys_linux_ppc64le.go
+++ b/ipv4/zsys_linux_ppc64le.go
@@ -4,7 +4,6 @@
 package ipv4
 
 const (
-	sysIP_PKTINFO = 0x8
 	sysIP_RECVTTL = 0xc
 
 	sizeofKernelSockaddrStorage = 0x80
diff --git a/ipv4/zsys_linux_riscv64.go b/ipv4/zsys_linux_riscv64.go
index bd32567..b31766a 100644
--- a/ipv4/zsys_linux_riscv64.go
+++ b/ipv4/zsys_linux_riscv64.go
@@ -7,7 +7,6 @@
 package ipv4
 
 const (
-	sysIP_PKTINFO = 0x8
 	sysIP_RECVTTL = 0xc
 
 	sizeofKernelSockaddrStorage = 0x80
diff --git a/ipv4/zsys_linux_s390x.go b/ipv4/zsys_linux_s390x.go
index fcf9fa2..7b40aa1 100644
--- a/ipv4/zsys_linux_s390x.go
+++ b/ipv4/zsys_linux_s390x.go
@@ -4,7 +4,6 @@
 package ipv4
 
 const (
-	sysIP_PKTINFO = 0x8
 	sysIP_RECVTTL = 0xc
 
 	sizeofKernelSockaddrStorage = 0x80
diff --git a/ipv4/zsys_solaris.go b/ipv4/zsys_solaris.go
index c110b20..1cdc45c 100644
--- a/ipv4/zsys_solaris.go
+++ b/ipv4/zsys_solaris.go
@@ -8,8 +8,6 @@
 	sysIP_RECVIF      = 0x9
 	sysIP_RECVTTL     = 0xb
 
-	sysIP_PKTINFO = 0x1a
-
 	sizeofSockaddrStorage = 0x100
 	sizeofSockaddrInet    = 0x10
 	sizeofInetPktinfo     = 0xc