diff --git a/libavcodec/tscc.c b/libavcodec/tscc.c
index e1a075faa7..841f0c0d14 100644
--- a/libavcodec/tscc.c
+++ b/libavcodec/tscc.c
@@ -191,5 +191,5 @@ const AVCodec ff_tscc_decoder = {
     .close          = decode_end,
     .decode         = decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
-    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
 };