diff --git a/client.go b/client.go
index 155dd8b..1969f1e 100644
--- a/client.go
+++ b/client.go
@@ -86,8 +86,9 @@ func (c *Client) Do(req *Request) (*Response, error) {
 	if req.Host != "" {
 		hostname, port, err = net.SplitHostPort(req.Host)
 		if err != nil {
-			// Port is required
-			return nil, err
+			// Likely no port
+			hostname = req.Host
+			port = "1965"
 		}
 		// Punycode hostname
 		hostname, err = punycodeHostname(hostname)
diff --git a/request.go b/request.go
index b111388..5356112 100644
--- a/request.go
+++ b/request.go
@@ -19,7 +19,7 @@ type Request struct {
 	URL *url.URL
 
 	// For client requests, Host optionally specifies the server to
-	// connect to. It must be of the form "host:port".
+	// connect to. It may be of the form "host" or "host:port".
 	// If empty, the value of URL.Host is used.
 	// For international domain names, Host may be in Punycode or
 	// Unicode form. Use golang.org/x/net/idna to convert it to