diff --git a/libavcodec/proresenc_kostya.c b/libavcodec/proresenc_kostya.c
index d140ef053a..2e39ed41da 100644
--- a/libavcodec/proresenc_kostya.c
+++ b/libavcodec/proresenc_kostya.c
@@ -1415,4 +1415,5 @@ const AVCodec ff_prores_ks_encoder = {
                       },
     .priv_class     = &proresenc_class,
     .profiles       = NULL_IF_CONFIG_SMALL(ff_prores_profiles),
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };