diff --git a/protocol/rtsp/rtsp.go b/protocol/rtsp/rtsp.go
index 0140b569..029a57f1 100644
--- a/protocol/rtsp/rtsp.go
+++ b/protocol/rtsp/rtsp.go
@@ -43,7 +43,7 @@ import (
 // Minimum response size to be considered valid in bytes.
 const minResponse = 12
 
-var errSmallResponse = errors.New("response too small")
+var errInvalidResponse = errors.New("invalid response")
 
 // Request describes an RTSP request.
 type Request struct {
@@ -132,12 +132,8 @@ func ReadResponse(r io.Reader) (*Response, error) {
 	}
 	s := scanner.Text()
 
-	if len(s) < minResponse {
-		return nil, errSmallResponse
-	}
-
-	if s[:5] != "RTSP/" {
-		return nil, errors.New("invalid response")
+	if len(s) < minResponse || s[:5] != "RTSP/" {
+		return nil, errInvalidResponse
 	}
 	resp.Proto = "RTSP"
 
diff --git a/protocol/rtsp/rtsp_test.go b/protocol/rtsp/rtsp_test.go
index dcdf7148..f1a2257b 100644
--- a/protocol/rtsp/rtsp_test.go
+++ b/protocol/rtsp/rtsp_test.go
@@ -213,7 +213,7 @@ func TestMethods(t *testing.T) {
 
 		for i, test := range tests {
 			_, err = test.method(clt)
-			if err != nil && err != io.EOF && err != errSmallResponse {
+			if err != nil && err != io.EOF && err != errInvalidResponse {
 				clientErr <- errors.New(fmt.Sprintf("error request for: %v err: %v", i, err))
 			}
 		}