diff --git a/Tests/CanvasTests.cs b/Tests/CanvasTests.cs
index 12d8a9b..d8eed6b 100644
--- a/Tests/CanvasTests.cs
+++ b/Tests/CanvasTests.cs
@@ -49,7 +49,7 @@ namespace Tests
             Assert.AreEqual (640, c.Width);
             Assert.AreEqual (480, c.Height);
             c.Width = 0;
-            c.Height = 0;
+            c.Height = -100;
             Assert.AreEqual (150, c.Width);
             Assert.AreEqual (150, c.Height);
         }