diff --git a/libavcodec/tiertexseqv.c b/libavcodec/tiertexseqv.c
index e5b863b6af..7170eb3155 100644
--- a/libavcodec/tiertexseqv.c
+++ b/libavcodec/tiertexseqv.c
@@ -271,4 +271,5 @@ const AVCodec ff_tiertexseqvideo_decoder = {
     .close          = seqvideo_decode_end,
     .decode         = seqvideo_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };