diff --git a/lib/child_process.js b/lib/child_process.js
index 74699a16834c30..c72270de103935 100644
--- a/lib/child_process.js
+++ b/lib/child_process.js
@@ -99,8 +99,7 @@ function fork(modulePath /* , args, options */) {
     args = arguments[pos++];
   }
 
-  if (pos < arguments.length &&
-      (arguments[pos] === undefined || arguments[pos] === null)) {
+  if (pos < arguments.length && arguments[pos] == null) {
     pos++;
   }