diff --git a/Src/Newtonsoft.Json.Portable40.sln b/Src/Newtonsoft.Json.Portable40.sln
new file mode 100644
index 00000000..8b361b36
--- /dev/null
+++ b/Src/Newtonsoft.Json.Portable40.sln
@@ -0,0 +1,32 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2012
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Lib", "Lib", "{620042D9-2753-48F5-BEDE-3905248781D2}"
+	ProjectSection(SolutionItems) = preProject
+		Lib\NUnit\DotNet\nunit.framework.dll = Lib\NUnit\DotNet\nunit.framework.dll
+		Lib\NUnit\DotNet\nunit.framework.xml = Lib\NUnit\DotNet\nunit.framework.xml
+	EndProjectSection
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Newtonsoft.Json.Portable40", "Newtonsoft.Json\Newtonsoft.Json.Portable40.csproj", "{959F7F85-C98B-4876-971A-9036224578E4}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Newtonsoft.Json.Tests.Portable40", "Newtonsoft.Json.Tests\Newtonsoft.Json.Tests.Portable40.csproj", "{3E6E2335-B079-4B5B-A65A-9D586914BCBB}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{959F7F85-C98B-4876-971A-9036224578E4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{959F7F85-C98B-4876-971A-9036224578E4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{959F7F85-C98B-4876-971A-9036224578E4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{959F7F85-C98B-4876-971A-9036224578E4}.Release|Any CPU.Build.0 = Release|Any CPU
+		{3E6E2335-B079-4B5B-A65A-9D586914BCBB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3E6E2335-B079-4B5B-A65A-9D586914BCBB}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3E6E2335-B079-4B5B-A65A-9D586914BCBB}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3E6E2335-B079-4B5B-A65A-9D586914BCBB}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal
diff --git a/Src/Newtonsoft.Json/Utilities/MathUtils.cs b/Src/Newtonsoft.Json/Utilities/MathUtils.cs
index c109de70..2b92368e 100644
--- a/Src/Newtonsoft.Json/Utilities/MathUtils.cs
+++ b/Src/Newtonsoft.Json/Utilities/MathUtils.cs
@@ -29,7 +29,7 @@ using System.Text;
 
 namespace Newtonsoft.Json.Utilities
 {
-  internal class MathUtils
+  internal static class MathUtils
   {
     public static int IntLength(int i)
     {