diff --git a/render/reader.go b/render/reader.go
index ab60e53..312af74 100644
--- a/render/reader.go
+++ b/render/reader.go
@@ -36,8 +36,8 @@ func (r Reader) WriteContentType(w http.ResponseWriter) {
 func (r Reader) writeHeaders(w http.ResponseWriter, headers map[string]string) {
 	header := w.Header()
 	for k, v := range headers {
-		if val := header[k]; len(val) == 0 {
-			header[k] = []string{v}
+		if header.Get(k) == "" {
+			header.Set(k, v)
 		}
 	}
 }
diff --git a/render/render_test.go b/render/render_test.go
index 3df04a1..76e29ee 100644
--- a/render/render_test.go
+++ b/render/render_test.go
@@ -470,6 +470,7 @@ func TestRenderReader(t *testing.T) {
 	body := "#!PNG some raw data"
 	headers := make(map[string]string)
 	headers["Content-Disposition"] = `attachment; filename="filename.png"`
+	headers["x-request-id"] = "requestId"
 
 	err := (Reader{
 		ContentLength: int64(len(body)),
@@ -483,4 +484,5 @@ func TestRenderReader(t *testing.T) {
 	assert.Equal(t, "image/png", w.Header().Get("Content-Type"))
 	assert.Equal(t, strconv.Itoa(len(body)), w.Header().Get("Content-Length"))
 	assert.Equal(t, headers["Content-Disposition"], w.Header().Get("Content-Disposition"))
+	assert.Equal(t, headers["x-request-id"], w.Header().Get("x-request-id"))
 }