diff --git a/lib/_http_outgoing.js b/lib/_http_outgoing.js
index f40c94eb21b23a..b7f0a9d5e67a15 100644
--- a/lib/_http_outgoing.js
+++ b/lib/_http_outgoing.js
@@ -607,15 +607,14 @@ OutgoingMessage.prototype.getHeaderNames = function getHeaderNames() {
 // Returns an array of the names of the current outgoing raw headers.
 OutgoingMessage.prototype.getRawHeaderNames = function getRawHeaderNames() {
   const headersMap = this[kOutHeaders];
-  const headers = Array(ObjectKeys(headersMap).length);
+  if (headersMap === null) return [];
 
-  if (headersMap !== null) {
-    const values = ObjectValues(headersMap);
-    // Retain for(;;) loop for performance reasons
-    // Refs: https://github.com/nodejs/node/pull/30958
-    for (let i = 0, l = values.length; i < l; i++) {
-      headers[i] = values[i][0];
-    }
+  const values = ObjectValues(headersMap);
+  const headers = Array(values.length);
+  // Retain for(;;) loop for performance reasons
+  // Refs: https://github.com/nodejs/node/pull/30958
+  for (let i = 0, l = values.length; i < l; i++) {
+    headers[i] = values[i][0];
   }
 
   return headers;