diff --git a/libavcodec/ljpegenc.c b/libavcodec/ljpegenc.c
index 80b5e799ed..d820b9a0f5 100644
--- a/libavcodec/ljpegenc.c
+++ b/libavcodec/ljpegenc.c
@@ -337,4 +337,5 @@ const AVCodec ff_ljpeg_encoder = {
         AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
         AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,
         AV_PIX_FMT_NONE},
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };