diff --git a/libavcodec/alacenc.c b/libavcodec/alacenc.c
index 90c27884db..b7b82b2c49 100644
--- a/libavcodec/alacenc.c
+++ b/libavcodec/alacenc.c
@@ -528,5 +528,6 @@ AVCodec alac_encoder = {
     alac_encode_frame,
     alac_encode_close,
     .capabilities = CODEC_CAP_SMALL_LAST_FRAME,
+    .sample_fmts = (const enum SampleFormat[]){ SAMPLE_FMT_S16, SAMPLE_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("ALAC (Apple Lossless Audio Codec)"),
 };