diff --git a/Shared/FpsCounter.cs b/Shared/FpsCounter.cs
index fff76f7..3e60ef8 100644
--- a/Shared/FpsCounter.cs
+++ b/Shared/FpsCounter.cs
@@ -2,8 +2,8 @@ using System;
 
 namespace SemiColinGames {
   class FpsCounter {
+    private readonly int[] frameTimes = new int[60];
     private double fps = 0;
-    private int[] frameTimes = new int[60];
     private int idx = 0;
 
     public int Fps {