diff --git a/lib/Server.js b/lib/Server.js
index 6e407a55da..8193582d8f 100644
--- a/lib/Server.js
+++ b/lib/Server.js
@@ -1847,7 +1847,7 @@ class Server {
 
       const allHeaders = [];
 
-      if (typeof headers === "object" && !Array.isArray(headers)) {
+      if (!Array.isArray(headers)) {
         // eslint-disable-next-line guard-for-in
         for (const name in headers) {
           allHeaders.push({ key: name, value: headers[name] });