diff --git a/libavcodec/argo.c b/libavcodec/argo.c
index 0df66f1cee..87c646f56c 100644
--- a/libavcodec/argo.c
+++ b/libavcodec/argo.c
@@ -736,5 +736,5 @@ const AVCodec ff_argo_decoder = {
     .flush          = decode_flush,
     .close          = decode_close,
     .capabilities   = AV_CODEC_CAP_DR1,
-    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
 };