diff --git a/libavcodec/lclenc.c b/libavcodec/lclenc.c
index 0afe5530ba..201d357898 100644
--- a/libavcodec/lclenc.c
+++ b/libavcodec/lclenc.c
@@ -197,5 +197,6 @@ AVCodec ff_zlib_encoder = {
     .init           = encode_init,
     .encode2        = encode_frame,
     .close          = encode_end,
+    .capabilities   = CODEC_CAP_FRAME_THREADS | CODEC_CAP_INTRA_ONLY,
     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
 };