diff --git a/src/nsupdate.rs b/src/nsupdate.rs
index 74397fa..1b94237 100644
--- a/src/nsupdate.rs
+++ b/src/nsupdate.rs
@@ -1,5 +1,6 @@
 use std::{
     ffi::OsStr,
+    io::Write,
     net::IpAddr,
     path::Path,
     process::{ExitStatus, Stdio},