diff --git a/go.mod b/go.mod
index 0554be2..83eebc1 100644
--- a/go.mod
+++ b/go.mod
@@ -6,4 +6,5 @@ require (
 	github.com/cybozu-go/netutil v1.2.0
 	github.com/cybozu-go/well v1.8.1
 	golang.org/x/net v0.0.0-20180911220305-26e67e76b6c3
+	golang.org/x/sys v0.0.0-20180906133057-8cf3aee42992
 )
diff --git a/original_dst_linux.go b/original_dst_linux.go
index cc9bbfb..21c303c 100644
--- a/original_dst_linux.go
+++ b/original_dst_linux.go
@@ -3,9 +3,9 @@
 package transocks
 
 import (
+	syscall "golang.org/x/sys/unix"
 	"net"
 	"os"
-	"syscall"
 	"unsafe"
 )