diff --git a/src/TerraSharp/UI/WindowManager.cs b/src/TerraSharp/UI/WindowManager.cs
index dab6dfa..5917698 100644
--- a/src/TerraSharp/UI/WindowManager.cs
+++ b/src/TerraSharp/UI/WindowManager.cs
@@ -108,7 +108,8 @@ public static class WindowManager
             Unfocus();
     }
 
-    static Vector2 ClampPosition(Window window, Vector2 position) => new(MathHelper.Clamp(position.X, 0f, Math.Max(0f, Main.screenWidth / Main.UIScale - window.Width)), MathHelper.Clamp(position.Y, 0f, Math.Max(0f, Main.screenHeight / Main.UIScale - window.Height)));
+    // PlayerInput.SetZoom_UI already divides Main.screenWidth/Height by the UI scale inside UI layers.
+    static Vector2 ClampPosition(Window window, Vector2 position) => new(MathHelper.Clamp(position.X, 0f, Math.Max(0f, PlayerInput.RealScreenWidth / Main.UIScale - window.Width)), MathHelper.Clamp(position.Y, 0f, Math.Max(0f, PlayerInput.RealScreenHeight / Main.UIScale - window.Height)));
 
     public static void Draw(SpriteBatch spriteBatch)
     {