diff --git a/libavcodec/tscc2.c b/libavcodec/tscc2.c
index 9fa28fe9fc..630e17522c 100644
--- a/libavcodec/tscc2.c
+++ b/libavcodec/tscc2.c
@@ -370,5 +370,5 @@ AVCodec ff_tscc2_decoder = {
     .close          = tscc2_decode_end,
     .decode         = tscc2_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
-    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
+    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_INIT_THREADSAFE,
 };