diff --git a/libavcodec/sonic.c b/libavcodec/sonic.c
index a96e687748..a8cd93ad8b 100644
--- a/libavcodec/sonic.c
+++ b/libavcodec/sonic.c
@@ -974,6 +974,7 @@ AVCodec ff_sonic_encoder = {
     .priv_data_size = sizeof(SonicContext),
     .init           = sonic_encode_init,
     .encode2        = sonic_encode_frame,
+    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE },
     .capabilities   = CODEC_CAP_EXPERIMENTAL,
     .close          = sonic_encode_close,
     .long_name = NULL_IF_CONFIG_SMALL("Sonic"),
@@ -988,6 +989,7 @@ AVCodec ff_sonic_ls_encoder = {
     .priv_data_size = sizeof(SonicContext),
     .init           = sonic_encode_init,
     .encode2        = sonic_encode_frame,
+    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE },
     .capabilities   = CODEC_CAP_EXPERIMENTAL,
     .close          = sonic_encode_close,
     .long_name = NULL_IF_CONFIG_SMALL("Sonic lossless"),