diff --git a/libavformat/aiff.c b/libavformat/aiff.c
index 1685a306b1..91be89b303 100644
--- a/libavformat/aiff.c
+++ b/libavformat/aiff.c
@@ -130,6 +130,10 @@ static unsigned int get_aiff_header(ByteIOContext *pb, AVCodecContext *codec,
             codec->block_align = 34*codec->channels;
             codec->frame_size = 64;
             break;
+        case CODEC_ID_MACE3:
+        case CODEC_ID_MACE6:
+            codec->frame_size = 6;
+            break;
         default:
             break;
         }