diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index 0810c56a8b..cde4447c8e 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -602,8 +602,8 @@ static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
                 if (proto[0] == '\0') {
                     /* relative control URL */
                     if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
-                    av_strlcat(rtsp_st->control_url, "/",
-                               sizeof(rtsp_st->control_url));
+                        av_strlcat(rtsp_st->control_url, "/",
+                                   sizeof(rtsp_st->control_url));
                     av_strlcat(rtsp_st->control_url, p,
                                sizeof(rtsp_st->control_url));
                 } else