diff --git a/libavcodec/alacenc.c b/libavcodec/alacenc.c
index d6b2e1c991..eddd9c97c3 100644
--- a/libavcodec/alacenc.c
+++ b/libavcodec/alacenc.c
@@ -646,4 +646,5 @@ const AVCodec ff_alac_encoder = {
     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S32P,
                                                      AV_SAMPLE_FMT_S16P,
                                                      AV_SAMPLE_FMT_NONE },
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };