diff --git a/test/parallel/test-http-outgoing-internal-headers.js b/test/parallel/test-http-outgoing-internal-headers.js
index 7bd97bcb530955..17de5e7d075ce5 100644
--- a/test/parallel/test-http-outgoing-internal-headers.js
+++ b/test/parallel/test-http-outgoing-internal-headers.js
@@ -31,3 +31,14 @@ common.expectWarning('DeprecationWarning', warn, 'DEP0066');
       origin: ['Origin', 'localhost']
     }));
 }
+
+{
+  // Tests for _headers set method `null`
+  const outgoingMessage = new OutgoingMessage();
+  outgoingMessage._headers = null;
+
+  assert.strictEqual(
+    outgoingMessage[kOutHeaders],
+    null
+  );
+}