diff --git a/libavcodec/dfa.c b/libavcodec/dfa.c
index 13d1e71f82..0cf3641a38 100644
--- a/libavcodec/dfa.c
+++ b/libavcodec/dfa.c
@@ -424,4 +424,5 @@ const AVCodec ff_dfa_decoder = {
     .close          = dfa_decode_end,
     .decode         = dfa_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };