diff --git a/Shared/Input.cs b/Shared/Input.cs
index 41bf02c..ad33188 100644
--- a/Shared/Input.cs
+++ b/Shared/Input.cs
@@ -2,16 +2,16 @@ using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Input;
 
 namespace SemiColinGames {
-  struct Input {
-    public Vector2 Motion;
-    public bool Jump;
-    public bool Attack;
+  readonly struct Input {
+    public readonly Vector2 Motion;
+    public readonly bool Jump;
+    public readonly bool Attack;
 
-    public bool Pause;
-    public bool Debug;
-    public bool Exit;
-    public bool Restart;
-    public bool FullScreen;
+    public readonly bool Pause;
+    public readonly bool Debug;
+    public readonly bool Exit;
+    public readonly bool Restart;
+    public readonly bool FullScreen;
 
     public Input(GamePadState gamePad, KeyboardState keyboard) {
       Motion = new Vector2();