diff --git a/CHANGES.md b/CHANGES.md
index 714e6b67c..eff8d4cf7 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -7,7 +7,7 @@
 * Added `HttpServer::maxconn()` and `HttpServer::maxconnrate()`,
   accept backpressure #250
 
-* Allow to customize connection handshake process via `HttpServer::listen_with()` 
+* Allow to customize connection handshake process via `HttpServer::listen_with()`
   and `HttpServer::bind_with()` methods
 
 ### Fixed
@@ -19,6 +19,7 @@
 
 * Fix adding multiple response headers #446
 
+* Client includes port in HOST header when it is not default(e.g. not 80 and 443). #448
 
 ## [0.7.3] - 2018-08-01
 
diff --git a/src/client/request.rs b/src/client/request.rs
index 4d506c3fa..aff4ab485 100644
--- a/src/client/request.rs
+++ b/src/client/request.rs
@@ -629,7 +629,14 @@ impl ClientRequestBuilder {
             if let Some(parts) = parts(&mut self.request, &self.err) {
                 if let Some(host) = parts.uri.host() {
                     if !parts.headers.contains_key(header::HOST) {
-                        match host.try_into() {
+                        let mut wrt = BytesMut::with_capacity(host.len() + 5).writer();
+
+                        let _ = match parts.uri.port() {
+                            None | Some(80) | Some(443) => write!(wrt, "{}", host),
+                            Some(port) => write!(wrt, "{}:{}", host, port),
+                        };
+
+                        match wrt.get_mut().take().freeze().try_into() {
                             Ok(value) => {
                                 parts.headers.insert(header::HOST, value);
                             }