diff --git a/libavcodec/cdxl.c b/libavcodec/cdxl.c
index 7c82967df0..96ae14c418 100644
--- a/libavcodec/cdxl.c
+++ b/libavcodec/cdxl.c
@@ -335,4 +335,5 @@ AVCodec ff_cdxl_decoder = {
     .close          = cdxl_decode_end,
     .decode         = cdxl_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };