diff --git a/libavcodec/dca.c b/libavcodec/dca.c
index e87a9e3ed4..58f3420586 100644
--- a/libavcodec/dca.c
+++ b/libavcodec/dca.c
@@ -1650,6 +1650,7 @@ static int dca_decode_frame(AVCodecContext * avctx,
     //set AVCodec values with parsed data
     avctx->sample_rate = s->sample_rate;
     avctx->bit_rate = s->bit_rate;
+    avctx->frame_size = s->sample_blocks * 32;
 
     s->profile = FF_PROFILE_DTS;