diff --git a/csharp/keys/Google.Protobuf.snk b/csharp/keys/Google.Protobuf.snk
new file mode 100644
index 00000000..7515443c
Binary files /dev/null and b/csharp/keys/Google.Protobuf.snk differ
diff --git a/csharp/keys/README.md b/csharp/keys/README.md
index 1a014198..ede67357 100644
--- a/csharp/keys/README.md
+++ b/csharp/keys/README.md
@@ -2,4 +2,8 @@ Contents
 --------
 
 - Google.Protobuf.public.snk:
-  Public key to verify strong name of Google.Protobuf assemblies.
\ No newline at end of file
+  Public key to verify strong name of Google.Protobuf assemblies.
+- Google.Protobuf.snk:
+  Signing key to provide strong name of Google.Protobuf assemblies.
+  As per [Microsoft guidance](https://msdn.microsoft.com/en-us/library/wd40t7ad(v=vs.110).aspx)
+  signing key should be checked into the repository.
diff --git a/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj b/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
index 20ae8e48..4f37c5e2 100644
--- a/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
+++ b/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
@@ -55,7 +55,7 @@
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
     <Prefer32Bit>false</Prefer32Bit>
     <SignAssembly>True</SignAssembly>
-    <AssemblyOriginatorKeyFile>C:\keys\Google.Protobuf.snk</AssemblyOriginatorKeyFile>
+    <AssemblyOriginatorKeyFile>..\..\keys\Google.Protobuf.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="mscorlib" />
diff --git a/csharp/src/Google.Protobuf/Google.Protobuf.csproj b/csharp/src/Google.Protobuf/Google.Protobuf.csproj
index 45ef8c63..ef524baf 100644
--- a/csharp/src/Google.Protobuf/Google.Protobuf.csproj
+++ b/csharp/src/Google.Protobuf/Google.Protobuf.csproj
@@ -64,7 +64,7 @@
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
     <SignAssembly>True</SignAssembly>
-    <AssemblyOriginatorKeyFile>C:\keys\Google.Protobuf.snk</AssemblyOriginatorKeyFile>
+    <AssemblyOriginatorKeyFile>..\..\keys\Google.Protobuf.snk</AssemblyOriginatorKeyFile>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
   <ItemGroup>