diff --git a/libavformat/ffmdec.c b/libavformat/ffmdec.c
index d2f16336c2..09f5779f68 100644
--- a/libavformat/ffmdec.c
+++ b/libavformat/ffmdec.c
@@ -354,6 +354,7 @@ static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
             codec->sample_rate = get_be32(pb);
             codec->channels = get_le16(pb);
             codec->frame_size = get_le16(pb);
+            codec->sample_fmt = get_le16(pb);
             break;
         default:
             goto fail;
diff --git a/libavformat/ffmenc.c b/libavformat/ffmenc.c
index eb97b8ba04..52d55d6936 100644
--- a/libavformat/ffmenc.c
+++ b/libavformat/ffmenc.c
@@ -172,6 +172,7 @@ static int ffm_write_header(AVFormatContext *s)
             put_be32(pb, codec->sample_rate);
             put_le16(pb, codec->channels);
             put_le16(pb, codec->frame_size);
+            put_le16(pb, codec->sample_fmt);
             break;
         default:
             return -1;