diff --git a/lib/internal/util.js b/lib/internal/util.js
index 0b1fa03cf1fab0..63d89051932967 100644
--- a/lib/internal/util.js
+++ b/lib/internal/util.js
@@ -326,14 +326,9 @@ function emitExperimentalWarning(feature, messagePrefix, code, ctor) {
 
 function filterDuplicateStrings(items, low) {
   const map = new SafeMap();
-  for (let i = 0; i < items.length; i++) {
-    const item = items[i];
+  for (const item of items) {
     const key = StringPrototypeToLowerCase(item);
-    if (low) {
-      map.set(key, key);
-    } else {
-      map.set(key, item);
-    }
+    map.set(key, low ? key : item);
   }
   return ArrayPrototypeSort(ArrayFrom(map.values()));
 }