diff --git a/libavcodec/dnxhddec.c b/libavcodec/dnxhddec.c
index b9e07a8562..c3eca7becf 100644
--- a/libavcodec/dnxhddec.c
+++ b/libavcodec/dnxhddec.c
@@ -729,4 +729,5 @@ const AVCodec ff_dnxhd_decoder = {
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
                       AV_CODEC_CAP_SLICE_THREADS,
     .profiles       = NULL_IF_CONFIG_SMALL(ff_dnxhd_profiles),
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };