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-rw-r--r--libavformat/rtpproto.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libavformat/rtpproto.c b/libavformat/rtpproto.c
index 1340665c74..dba1d35b03 100644
--- a/libavformat/rtpproto.c
+++ b/libavformat/rtpproto.c
@@ -86,7 +86,7 @@ int rtp_set_remote_url(URLContext *h, const char *uri)
* "http://host:port/path?option1=val1&option2=val2...
*/
-static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
+static av_printf_format(3, 4) void url_add_option(char *buf, int buf_size, const char *fmt, ...)
{
char buf1[1024];
va_list ap;