diff --git a/libavcodec/sanm.c b/libavcodec/sanm.c
index dddc2c871b..9506bbe04c 100644
--- a/libavcodec/sanm.c
+++ b/libavcodec/sanm.c
@@ -1525,4 +1525,5 @@ const AVCodec ff_sanm_decoder = {
     .close          = decode_end,
     .decode         = decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };