diff --git a/libavcodec/hcadec.c b/libavcodec/hcadec.c
index ef3af08c4c..f5e23efc5b 100644
--- a/libavcodec/hcadec.c
+++ b/libavcodec/hcadec.c
@@ -455,7 +455,7 @@ const AVCodec ff_hca_decoder = {
     .decode         = decode_frame,
     .close          = decode_close,
     .capabilities   = AV_CODEC_CAP_DR1,
-    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
                                                       AV_SAMPLE_FMT_NONE },
 };