diff --git a/fasthttpproxy/http.go b/fasthttpproxy/http.go
index 6bc9c1e5b3..2d918135f2 100644
--- a/fasthttpproxy/http.go
+++ b/fasthttpproxy/http.go
@@ -49,7 +49,7 @@ func FasthttpHTTPDialerTimeout(proxy string, timeout time.Duration) fasthttp.Dia
 			return nil, err
 		}
 
-		req := "CONNECT " + addr + " HTTP/1.1\r\n"
+		req := fmt.Sprintf("CONNECT %s HTTP/1.1\r\nHost: %s\r\n", addr, addr)
 		if auth != "" {
 			req += "Proxy-Authorization: Basic " + auth + "\r\n"
 		}