diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index 3bc7671a3c..3675045dbc 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -53,7 +53,6 @@
 
 /* Default timeout values for read packet in seconds  */
 #define READ_PACKET_TIMEOUT_S 10
-#define SDP_MAX_SIZE 16384
 #define RECVBUF_SIZE 10 * RTP_MAX_PACKET_LENGTH
 #define DEFAULT_REORDERING_DELAY 100000
 
@@ -688,14 +687,6 @@ int ff_sdp_parse(AVFormatContext *s, const char *content)
 {
     const char *p;
     int letter, i;
-    /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
-     * contain long SDP lines containing complete ASF Headers (several
-     * kB) or arrays of MDPR (RM stream descriptor) headers plus
-     * "rulebooks" describing their properties. Therefore, the SDP line
-     * buffer is large.
-     *
-     * The Vorbis FMTP line can be up to 16KB - see xiph_parse_sdp_line
-     * in rtpdec_xiph.c. */
     char buf[SDP_MAX_SIZE], *q;
     SDPParseState sdp_parse_state = { { 0 } }, *s1 = &sdp_parse_state;
 
diff --git a/libavformat/rtsp.h b/libavformat/rtsp.h
index 2b37f5b49f..251ed86d19 100644
--- a/libavformat/rtsp.h
+++ b/libavformat/rtsp.h
@@ -78,6 +78,7 @@ enum RTSPControlTransport {
 #define RTSP_DEFAULT_AUDIO_SAMPLERATE 44100
 #define RTSP_RTP_PORT_MIN 5000
 #define RTSP_RTP_PORT_MAX 65000
+#define SDP_MAX_SIZE 16384
 
 /**
  * This describes a single item in the "Transport:" line of one stream as
diff --git a/libavformat/rtspenc.c b/libavformat/rtspenc.c
index 97e3ef6da3..d50544456d 100644
--- a/libavformat/rtspenc.c
+++ b/libavformat/rtspenc.c
@@ -34,7 +34,6 @@
 #include "libavutil/time.h"
 #include "url.h"
 
-#define SDP_MAX_SIZE 16384
 
 static const AVClass rtsp_muxer_class = {
     .class_name = "RTSP muxer",