diff --git a/src/callbacks.rs b/src/callbacks.rs
index 99afeda..2693f8a 100644
--- a/src/callbacks.rs
+++ b/src/callbacks.rs
@@ -64,7 +64,7 @@ fn handle_connect(
     _: &str,
     socket_addr: Option<SocketAddr>,
 ) -> milter::Result<Status> {
-    let ip = socket_addr.map_or_else(|| IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), |a| a.ip());
+    let ip = socket_addr.map_or_else(|| IpAddr::V4(Ipv4Addr::LOCALHOST), |a| a.ip());
 
     if config::get().use_trusted_networks() {
         if config::get().is_in_trusted_networks(&ip) {
diff --git a/tests/common/mod.rs b/tests/common/mod.rs
index f2b839a..242976d 100644
--- a/tests/common/mod.rs
+++ b/tests/common/mod.rs
@@ -19,7 +19,7 @@ pub fn spawn_mock_spamd_server<F>(port: u16, f: F) -> JoinHandle<()>
 where
     F: Fn(String) -> HamOrSpam + Send + 'static,
 {
-    let socket_addr = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), port);
+    let socket_addr = SocketAddrV4::new(Ipv4Addr::LOCALHOST, port);
     let timeout = Duration::from_secs(15);
 
     thread::spawn(move || {