diff --git a/libmpdemux/demux_lavf.c b/libmpdemux/demux_lavf.c
index 64d8c04970..5d1855cd05 100644
--- a/libmpdemux/demux_lavf.c
+++ b/libmpdemux/demux_lavf.c
@@ -250,7 +250,7 @@ static int lavf_check_preferred_file(demuxer_t *demuxer){
 static demuxer_t* demux_open_lavf(demuxer_t *demuxer){
     AVFormatContext *avfc;
     AVFormatParameters ap;
-    AVOption *opt;
+    const AVOption *opt;
     lavf_priv_t *priv= demuxer->priv;
     int i,g;
     char mp_filename[256]="mp:";