diff --git a/libavformat/rtspdec.c b/libavformat/rtspdec.c
index bd2e8f47f1..dfa29913bf 100644
--- a/libavformat/rtspdec.c
+++ b/libavformat/rtspdec.c
@@ -289,9 +289,7 @@ static int rtsp_read_setup(AVFormatContext *s, char* host, char *controlurl)
     } else {
         do {
             AVDictionary *opts = NULL;
-            char buf[256];
-            snprintf(buf, sizeof(buf), "%d", rt->buffer_size);
-            av_dict_set(&opts, "buffer_size", buf, 0);
+            av_dict_set_int(&opts, "buffer_size", rt->buffer_size, 0);
             ff_url_join(url, sizeof(url), "rtp", NULL, host, localport, NULL);
             av_log(s, AV_LOG_TRACE, "Opening: %s", url);
             ret = ffurl_open_whitelist(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,