diff --git a/libavformat/rtp.c b/libavformat/rtp.c
index 29b58f3eba..5f45afb0cb 100644
--- a/libavformat/rtp.c
+++ b/libavformat/rtp.c
@@ -32,7 +32,7 @@
 static const struct
 {
     int pt;
-    const char enc_name[50]; /* XXX: why 50 ? */
+    const char enc_name[6];
     enum CodecType codec_type;
     enum CodecID codec_id;
     int clock_rate;