diff --git a/internal/download/fetch.go b/internal/download/fetch.go
index 41d9b72a..4874da22 100644
--- a/internal/download/fetch.go
+++ b/internal/download/fetch.go
@@ -41,6 +41,9 @@ func (HTTPFetcher) Get(uri string) (io.ReadCloser, error) {
 	if err != nil {
 		return nil, errors.Wrapf(err, "failed to download %q", uri)
 	}
+	if resp.StatusCode >= 400 {
+		return nil, errors.Errorf("failed to download %q, status code %d", uri, resp.StatusCode)
+	}
 	return resp.Body, nil
 }