diff --git a/libavcodec/truespeech.c b/libavcodec/truespeech.c
index 5eac34fefc..a65ced15d7 100644
--- a/libavcodec/truespeech.c
+++ b/libavcodec/truespeech.c
@@ -364,4 +364,5 @@ const AVCodec ff_truespeech_decoder = {
     .init           = truespeech_decode_init,
     .decode         = truespeech_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };