diff --git a/day10.kts b/day10.kts
index cc342a3..9029a81 100755
--- a/day10.kts
+++ b/day10.kts
@@ -2,7 +2,7 @@
 import java.util.Scanner
 
 
-    class TrailHead(var x: Int, var y: Int, private val map: Map) {
+    class TrailHead(private val x: Int, private val y: Int, private val map: Map) {
         private val peaks = mutableMapOf<Pair<Int, Int>, Int>()
         fun getScore(): Int {
             if (this.peaks.isEmpty()) {