diff --git a/libavcodec/roqaudioenc.c b/libavcodec/roqaudioenc.c
index 9a636179b1..e794d8e0a8 100644
--- a/libavcodec/roqaudioenc.c
+++ b/libavcodec/roqaudioenc.c
@@ -195,4 +195,5 @@ const AVCodec ff_roq_dpcm_encoder = {
     .capabilities   = AV_CODEC_CAP_DELAY,
     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
                                                      AV_SAMPLE_FMT_NONE },
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };