diff --git a/if.go b/if.go
index 9f3a97e..f48d229 100644
--- a/if.go
+++ b/if.go
@@ -1,14 +1,12 @@
 package water
 
-import (
-	"os"
-)
+import "io"
 
 // Interface is a TUN/TAP interface.
 type Interface struct {
 	isTAP bool
-	file  *os.File
-	name  string
+	io.ReadWriteCloser
+	name string
 }
 
 // Create a new TAP interface whose name is ifName.
@@ -39,15 +37,3 @@ func (ifce *Interface) IsTAP() bool {
 func (ifce *Interface) Name() string {
 	return ifce.name
 }
-
-// Implement io.Writer interface.
-func (ifce *Interface) Write(p []byte) (n int, err error) {
-	n, err = ifce.file.Write(p)
-	return
-}
-
-// Implement io.Reader interface.
-func (ifce *Interface) Read(p []byte) (n int, err error) {
-	n, err = ifce.file.Read(p)
-	return
-}
diff --git a/syscalls_linux.go b/syscalls_linux.go
index e69c3d9..e1ba63f 100644
--- a/syscalls_linux.go
+++ b/syscalls_linux.go
@@ -30,7 +30,7 @@ func newTAP(ifName string) (ifce *Interface, err error) {
 	if err != nil {
 		return nil, err
 	}
-	ifce = &Interface{isTAP: true, file: file, name: name}
+	ifce = &Interface{isTAP: true, ReadWriteCloser: file, name: name}
 	return
 }
 
@@ -43,7 +43,7 @@ func newTUN(ifName string) (ifce *Interface, err error) {
 	if err != nil {
 		return nil, err
 	}
-	ifce = &Interface{isTAP: false, file: file, name: name}
+	ifce = &Interface{isTAP: false, ReadWriteCloser: file, name: name}
 	return
 }