diff --git a/protocol/rtsp/client.go b/protocol/rtsp/client.go
index 519f17d2..24265c65 100644
--- a/protocol/rtsp/client.go
+++ b/protocol/rtsp/client.go
@@ -36,11 +36,11 @@ import (
 
 // Client describes an RTSP Client.
 type Client struct {
-	cSeq    int
-	addr    string
-	url     *url.URL
-	conn    net.Conn
-	session string
+	cSeq      int
+	addr      string
+	url       *url.URL
+	conn      net.Conn
+	sessionID string
 }
 
 // NewClient returns a pointer to a new Client. The URL u will be parsed and
@@ -95,7 +95,7 @@ func (c *Client) Setup(track, transport string) (*Response, error) {
 	if err != nil {
 		return nil, err
 	}
-	c.session = resp.Header.Get("Session")
+	c.sessionID = resp.Header.Get("Session")
 
 	return resp, err
 }
@@ -106,7 +106,7 @@ func (c *Client) Play() (*Response, error) {
 	if err != nil {
 		return nil, err
 	}
-	req.Header.Add("Session", c.session)
+	req.Header.Add("Session", c.sessionID)
 
 	return c.Do(req)
 }