diff --git a/lib/response.js b/lib/response.js
index 8027c19..4d79650 100644
--- a/lib/response.js
+++ b/lib/response.js
@@ -134,9 +134,9 @@ module.exports = {
     // no content
     if (null == val) {
       if (!statuses.empty[this.status]) this.status = 204;
-      this.res.removeHeader('Content-Type');
-      this.res.removeHeader('Content-Length');
-      this.res.removeHeader('Transfer-Encoding');
+      this.remove('Content-Type');
+      this.remove('Content-Length');
+      this.remove('Transfer-Encoding');
       return;
     }