diff --git a/appveyor.yml b/appveyor.yml
index 8f5a9d8294..1b10d99b4a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -9,8 +9,12 @@ environment:
     secure: XOgD5bJUKNOS2kDDgb+affS4pDcslxALh+xvvnr1Koy0PjXlhILsBdNhxRe0KcNm
 
 install:
-- appveyor DownloadFile http://download.xamarin.com/GTKforWindows/Windows/gtk-sharp-2.12.26.msi
-- start /wait msiexec /i gtk-sharp-2.12.26.msi /qn /norestart
+  - if not exist gtk-sharp-2.12.26.msi appveyor DownloadFile http://download.xamarin.com/GTKforWindows/Windows/gtk-sharp-2.12.26.msi
+  - msiexec /i gtk-sharp-2.12.26.msi /qn /norestart
+  - cmd: set PATH=%programfiles(x86)%\GtkSharp\2.12\bin\;%PATH%
+
+cache:
+  - gtk-sharp-2.12.26.msi
 
 configuration:
   - Release
diff --git a/src/Perspex.SceneGraph/Rect.cs b/src/Perspex.SceneGraph/Rect.cs
index 2dba97e764..c3d3a95111 100644
--- a/src/Perspex.SceneGraph/Rect.cs
+++ b/src/Perspex.SceneGraph/Rect.cs
@@ -297,7 +297,8 @@ namespace Perspex
         {
             if (obj is Rect)
             {
-                return this == (Rect)obj;
+                var other = (Rect)obj;
+                return Position == other.Position && Size == other.Size;
             }
 
             return false;
diff --git a/tests/Perspex.SceneGraph.UnitTests/Perspex.SceneGraph.UnitTests.csproj b/tests/Perspex.SceneGraph.UnitTests/Perspex.SceneGraph.UnitTests.csproj
index 7c4daf0867..f76c567f3a 100644
--- a/tests/Perspex.SceneGraph.UnitTests/Perspex.SceneGraph.UnitTests.csproj
+++ b/tests/Perspex.SceneGraph.UnitTests/Perspex.SceneGraph.UnitTests.csproj
@@ -72,6 +72,7 @@
     <Otherwise />
   </Choose>
   <ItemGroup>
+    <Compile Include="RelativeRectComparer.cs" />
     <Compile Include="RelativeRectTests.cs" />
     <Compile Include="ThicknessTests.cs" />
     <Compile Include="Media\BrushTests.cs" />
@@ -158,4 +159,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
\ No newline at end of file
+</Project>
diff --git a/tests/Perspex.SceneGraph.UnitTests/RelativeRectComparer.cs b/tests/Perspex.SceneGraph.UnitTests/RelativeRectComparer.cs
new file mode 100644
index 0000000000..667e2b4cbb
--- /dev/null
+++ b/tests/Perspex.SceneGraph.UnitTests/RelativeRectComparer.cs
@@ -0,0 +1,25 @@
+// Copyright (c) The Perspex Project. All rights reserved.
+// Licensed under the MIT license. See licence.md file in the project root for full license information.
+
+using System;
+using System.Collections.Generic;
+
+namespace Perspex.SceneGraph.UnitTests
+{
+    public class RelativeRectComparer : IEqualityComparer<RelativeRect>
+    {
+        public bool Equals(RelativeRect a, RelativeRect b)
+        {
+            return a.Unit == b.Unit &&
+                   Math.Round(a.Rect.X, 3) == Math.Round(b.Rect.X, 3) &&
+                   Math.Round(a.Rect.Y, 3) == Math.Round(b.Rect.Y, 3) &&
+                   Math.Round(a.Rect.Width, 3) == Math.Round(b.Rect.Width, 3) &&
+                   Math.Round(a.Rect.Height, 3) == Math.Round(b.Rect.Height, 3);
+        }
+
+        public int GetHashCode(RelativeRect obj)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/tests/Perspex.SceneGraph.UnitTests/RelativeRectTests.cs b/tests/Perspex.SceneGraph.UnitTests/RelativeRectTests.cs
index 9ee4e37e3f..625d73e95e 100644
--- a/tests/Perspex.SceneGraph.UnitTests/RelativeRectTests.cs
+++ b/tests/Perspex.SceneGraph.UnitTests/RelativeRectTests.cs
@@ -8,12 +8,14 @@ namespace Perspex.SceneGraph.UnitTests
 {
     public class RelativeRectTests
     {
+        private static readonly RelativeRectComparer Compare = new RelativeRectComparer();
+        
         [Fact]
         public void Parse_Should_Accept_Absolute_Value()
         {
             var result = RelativeRect.Parse("4,5,50,60", CultureInfo.InvariantCulture);
 
-            Assert.Equal(new RelativeRect(4, 5, 50, 60, RelativeUnit.Absolute), result);
+            Assert.Equal(new RelativeRect(4, 5, 50, 60, RelativeUnit.Absolute), result, Compare);
         }
 
         [Fact]
@@ -21,7 +23,7 @@ namespace Perspex.SceneGraph.UnitTests
         {
             var result = RelativeRect.Parse("10%, 20%, 40%, 70%", CultureInfo.InvariantCulture);
 
-            Assert.Equal(new RelativeRect(0.1, 0.2, 0.4, 0.7, RelativeUnit.Relative), result);
+            Assert.Equal(new RelativeRect(0.1, 0.2, 0.4, 0.7, RelativeUnit.Relative), result, Compare);
         }
     }
 }