diff --git a/overlay/tun_linux.go b/overlay/tun_linux.go
index 6d0fa911..8bd1609b 100644
--- a/overlay/tun_linux.go
+++ b/overlay/tun_linux.go
@@ -4,6 +4,7 @@
 package overlay
 
 import (
+	"encoding/binary"
 	"fmt"
 	"io"
 	"net"