diff --git a/scripts/lib/invocation-environment.js b/scripts/lib/invocation-environment.js
index 33cf45dab..f36a09252 100644
--- a/scripts/lib/invocation-environment.js
+++ b/scripts/lib/invocation-environment.js
@@ -2,14 +2,14 @@
 
 function resolveInvocationEnvironment(options = {}) {
   if (Object.prototype.hasOwnProperty.call(options, 'env')) {
-    return options.env || {};
+    return { ...(options.env || {}) };
   }
 
   if (typeof options.homeDir === 'string' && options.homeDir.trim() !== '') {
     return {};
   }
 
-  return process.env;
+  return { ...process.env };
 }
 
 module.exports = {