diff --git a/test/simple/test-net-GH-5504.js b/test/simple/test-net-GH-5504.js
index 08aceb89aac..7d0959f8ee1 100644
--- a/test/simple/test-net-GH-5504.js
+++ b/test/simple/test-net-GH-5504.js
@@ -73,7 +73,12 @@ function parent() {
   var serverExited = false;
   var clientExited = false;
   var serverListened = false;
-  var opt = { env: { NODE_DEBUG: 'net' } };
+  var opt = {
+    env: {
+      NODE_DEBUG: 'net',
+      NODE_COMMON_PORT: process.env.NODE_COMMON_PORT,
+    }
+  };
 
   process.on('exit', function() {
     assert(serverExited);