diff --git a/Shared/LinesOfSight.cs b/Shared/LinesOfSight.cs
index f7b3331..3a45ae0 100644
--- a/Shared/LinesOfSight.cs
+++ b/Shared/LinesOfSight.cs
@@ -2,6 +2,10 @@
 using Microsoft.Xna.Framework.Graphics;
 using System;
 
+// Disables "GraphicsDevice.DrawIndexedPrimitives(...) is obsolete." warning.
+// MonoGame has obsoleted this function, but FNA needs it.
+#pragma warning disable CS0618
+
 namespace SemiColinGames {
   public sealed class LinesOfSight : IDisposable {
 
@@ -119,7 +123,8 @@ namespace SemiColinGames {
 
         foreach (EffectPass pass in lightingEffect.CurrentTechnique.Passes) {
           pass.Apply();
-          graphics.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, indices.Length, 0, indices.Length / 3);
+          graphics.DrawIndexedPrimitives(
+              PrimitiveType.TriangleList, 0, 0, indices.Length, 0, indices.Length / 3);
         }
       }