diff --git a/lib/internal/bootstrap/loaders.js b/lib/internal/bootstrap/loaders.js
index 7a98e4c96c87d4..2889df4812bb03 100644
--- a/lib/internal/bootstrap/loaders.js
+++ b/lib/internal/bootstrap/loaders.js
@@ -174,7 +174,7 @@ const {
 } = internalBinding('native_module');
 
 NativeModule.map = new Map();
-for (var i = 0; i < moduleIds.length; ++i) {
+for (let i = 0; i < moduleIds.length; ++i) {
   const id = moduleIds[i];
   const mod = new NativeModule(id);
   NativeModule.map.set(id, mod);