diff --git a/libavformat/avio.h b/libavformat/avio.h
index e9d3b1752b..1b483b3a4d 100644
--- a/libavformat/avio.h
+++ b/libavformat/avio.h
@@ -623,9 +623,10 @@ int url_resetbuf(AVIOContext *s, int flags);
 int avio_open(AVIOContext **s, const char *url, int flags);
 
 int avio_close(AVIOContext *s);
-URLContext *url_fileno(AVIOContext *s);
 
 #if FF_API_OLD_AVIO
+attribute_deprecated URLContext *url_fileno(AVIOContext *s);
+
 /**
  * @deprecated use AVIOContext.max_packet_size directly.
  */
diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index 4cd3bdc47d..9f0f292aff 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -923,10 +923,12 @@ int avio_close(AVIOContext *s)
     return url_close(h);
 }
 
+#if FF_API_OLD_AVIO
 URLContext *url_fileno(AVIOContext *s)
 {
     return s->opaque;
 }
+#endif
 
 int avio_printf(AVIOContext *s, const char *fmt, ...)
 {