diff --git a/lib/_http_outgoing.js b/lib/_http_outgoing.js
index f28aecae71..8214826db8 100644
--- a/lib/_http_outgoing.js
+++ b/lib/_http_outgoing.js
@@ -413,6 +413,9 @@ OutgoingMessage.prototype._renderHeaders = function() {
   return headers;
 };
 
+OutgoingMessage.prototype._implicitHeader = function() {
+  throw new Error('_implicitHeader() method is not implemented');
+};
 
 Object.defineProperty(OutgoingMessage.prototype, 'headersSent', {
   configurable: true,
diff --git a/test/parallel/test-http-outgoing-proto.js b/test/parallel/test-http-outgoing-proto.js
new file mode 100644
index 0000000000..738e1d2c8c
--- /dev/null
+++ b/test/parallel/test-http-outgoing-proto.js
@@ -0,0 +1,14 @@
+'use strict';
+require('../common');
+const assert = require('assert');
+
+const http = require('http');
+const OutgoingMessage = http.OutgoingMessage;
+const ClientRequest = http.ClientRequest;
+const ServerResponse = http.ServerResponse;
+
+assert.throws(OutgoingMessage.prototype._implicitHeader);
+assert.strictEqual(
+  typeof ClientRequest.prototype._implicitHeader, 'function');
+assert.strictEqual(
+  typeof ServerResponse.prototype._implicitHeader, 'function');