diff --git a/Kotlin/src/main/kotlin/com/gildedrose/GildedRose.kt b/Kotlin/src/main/kotlin/com/gildedrose/GildedRose.kt
index 7ede7cee..33f752fd 100644
--- a/Kotlin/src/main/kotlin/com/gildedrose/GildedRose.kt
+++ b/Kotlin/src/main/kotlin/com/gildedrose/GildedRose.kt
@@ -1,6 +1,6 @@
 package com.gildedrose
 
-class GildedRose(var items: List<Item>) {
+class GildedRose(val items: List<Item>) {
 
     fun updateQuality() {
         for (i in items.indices) {