diff --git a/Documentation/build.md b/Documentation/build.md
index 56b028206d..8c2ef57b54 100644
--- a/Documentation/build.md
+++ b/Documentation/build.md
@@ -36,7 +36,7 @@ Avalonia requires [CastXML](https://github.com/CastXML/CastXML) for XML processi
 
 On macOS:
 ```
-brew install castxml
+brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/8a004a91a7fcd3f6620d5b01b6541ff0a640ffba/Formula/castxml.rb
 ```
 
 On Debian based Linux (Debian, Ubuntu, Mint, etc):
diff --git a/samples/RenderDemo/Controls/LineBoundsDemoControl.cs b/samples/RenderDemo/Controls/LineBoundsDemoControl.cs
index 0e0b3d6142..cc847a594d 100644
--- a/samples/RenderDemo/Controls/LineBoundsDemoControl.cs
+++ b/samples/RenderDemo/Controls/LineBoundsDemoControl.cs
@@ -17,7 +17,7 @@ namespace RenderDemo.Controls
         public LineBoundsDemoControl()
         {
             var timer = new DispatcherTimer();
-            timer.Interval = TimeSpan.FromSeconds(1 / 60);
+            timer.Interval = TimeSpan.FromSeconds(1 / 60.0);
             timer.Tick += (sender, e) => Angle += Math.PI / 360;
             timer.Start();
         }