diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 897a204e1d..36a799d728 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -386,6 +386,7 @@ static int mov_write_wave_tag(AVIOContext *pb, MOVTrack *track)
     } else if (track->enc->codec_id == CODEC_ID_AMR_NB) {
         mov_write_amr_tag(pb, track);
     } else if (track->enc->codec_id == CODEC_ID_AC3) {
+        mov_write_chan_tag(pb, track);
         mov_write_ac3_tag(pb, track);
     } else if (track->enc->codec_id == CODEC_ID_ALAC) {
         mov_write_extradata_tag(pb, track);