diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
index 7e8fa65818..a1842f43ab 100644
--- a/libavcodec/libx264.c
+++ b/libavcodec/libx264.c
@@ -743,7 +743,7 @@ AVCodec ff_libx264rgb_encoder = {
     .init           = X264_init,
     .encode2        = X264_frame,
     .close          = X264_close,
-    .capabilities   = CODEC_CAP_DELAY,
+    .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_AUTO_THREADS,
     .long_name      = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 RGB"),
     .priv_class     = &rgbclass,
     .defaults       = x264_defaults,