diff --git a/lib/child_process.js b/lib/child_process.js
index 26965aa6b9c504..0fd372e3112736 100644
--- a/lib/child_process.js
+++ b/lib/child_process.js
@@ -559,7 +559,7 @@ function spawnSync(file, args, options) {
     maxBuffer: MAX_BUFFER,
     ...opts.options
   };
-  options = opts.options = Object.assign(defaults, opts.options);
+  options = opts.options = defaults;
 
   debug('spawnSync', opts.args, options);