diff --git a/protocol/rtsp/rtsp.go b/protocol/rtsp/rtsp.go
index e46fdeb5..7f032967 100644
--- a/protocol/rtsp/rtsp.go
+++ b/protocol/rtsp/rtsp.go
@@ -81,10 +81,10 @@ func (r *Request) Write(w io.Writer) error {
 // String returns a formatted string of the Request.
 func (r Request) String() string {
 	var b strings.Builder
-	b.WriteString(r.Method + " " + r.URL.String() + " " + r.Proto + "/" + strconv.Itoa(r.ProtoMajor) + "." + strconv.Itoa(r.ProtoMinor) + "\r\n")
+	fmt.Fprintf(&b, "%s %s %s/%d.%d\r\n", r.Method, r.URL.String(), r.Proto, r.ProtoMajor, r.ProtoMinor)
 	for k, v := range r.Header {
 		for _, v := range v {
-			b.WriteString(k + ": " + v + "\r\n")
+			fmt.Fprintf(&b, "%s: %s\r\n", k, v)
 		}
 	}
 	b.WriteString("\r\n")
@@ -109,10 +109,10 @@ type Response struct {
 // String returns a formatted string of the Response.
 func (r Response) String() string {
 	var b strings.Builder
-	b.WriteString(r.Proto + "/" + strconv.Itoa(r.ProtoMajor) + "." + strconv.Itoa(r.ProtoMinor) + " " + strconv.Itoa(r.StatusCode) + "\n")
+	fmt.Fprintf(&b, "%s/%d.%d %d\n", r.Proto, r.ProtoMajor, r.ProtoMinor, r.StatusCode)
 	for k, v := range r.Header {
 		for _, v := range v {
-			b.WriteString(k + ": " + v + "\n")
+			fmt.Fprintf(&b, "%s: %s", k, v)
 		}
 	}
 	return b.String()