diff --git a/libavcodec/sanm.c b/libavcodec/sanm.c
index c30095ed32..a4f0a28c7c 100644
--- a/libavcodec/sanm.c
+++ b/libavcodec/sanm.c
@@ -1274,7 +1274,8 @@ static int process_frame_obj(SANMVideoContext *ctx)
         return old_codec48(ctx, w, h);
     default:
         avpriv_request_sample(ctx->avctx, "Subcodec %d", codec);
-        return AVERROR_PATCHWELCOME;
+        ctx->frame->flags |= AV_FRAME_FLAG_CORRUPT;
+        return 0;
     }
 }