diff --git a/csharp/Facebook.CSSLayout/MeasureOutput.cs b/csharp/Facebook.CSSLayout/MeasureOutput.cs
index 5ae6b9b0..10d93a33 100644
--- a/csharp/Facebook.CSSLayout/MeasureOutput.cs
+++ b/csharp/Facebook.CSSLayout/MeasureOutput.cs
@@ -18,7 +18,7 @@ namespace Facebook.CSSLayout
 
         public static long Make(int width, int height)
         {
-            return (long)(((ulong) width) << 32 | ((ulong) height));
+            return (long)(((ulong) width) << 32 | ((uint) height));
         }
 
         public static int GetWidth(long measureOutput)