diff --git a/packages.config b/packages.config
index 65f6e52d0e5..c2e734072bb 100644
--- a/packages.config
+++ b/packages.config
@@ -28,8 +28,9 @@
   <package id="BenchmarkDotNet" version="0.9.8"/>
   <package id="BenchmarkDotNet.Diagnostics.Windows" version="0.9.8"/>
   <package id="VisualCppTools" version="14.0.24519-Pre"/>
+  <package id="Newtonsoft.Json" version="6.0.8"/>
 
-	<!-- Annoyingly the build of FSharp.Compiler.Server.Shared references a Visual Studio-specific attribute -->
+  <!-- Annoyingly the build of FSharp.Compiler.Server.Shared references a Visual Studio-specific attribute -->
   <!-- That DLL is logically part of the F# Compiler and F# Interactive but is shipped as part of the Visual F# IDE Tools -->
   <package id="Microsoft.VisualStudio.Threading" version="14.1.131" targetFramework="net46" />
   <package id="Microsoft.VisualStudio.Shell.14.0" version="14.3.25407" targetFramework="net46" />
diff --git a/src/fsharp/FSharp.Compiler.Server.Shared/FSharp.Compiler.Server.Shared.fsproj b/src/fsharp/FSharp.Compiler.Server.Shared/FSharp.Compiler.Server.Shared.fsproj
index 62e8f108384..f7e5be8fb9a 100644
--- a/src/fsharp/FSharp.Compiler.Server.Shared/FSharp.Compiler.Server.Shared.fsproj
+++ b/src/fsharp/FSharp.Compiler.Server.Shared/FSharp.Compiler.Server.Shared.fsproj
@@ -46,6 +46,10 @@
       <HintPath>$(FSharpSourcesRoot)\..\packages\Microsoft.VisualStudio.Threading.14.1.131\lib\net45\Microsoft.VisualStudio.Threading.dll</HintPath>
     </Reference>
     <Reference Include="Microsoft.VisualStudio.Shell.Immutable.10.0.dll" />
+    <Reference Include="Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed">
+      <HintPath>$(FSharpSourcesRoot)\..\packages\Newtonsoft.Json.6.0.8\lib\net45\Newtonsoft.Json.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="$(FSharpSourcesRoot)\fsharp\FSharp.Core\FSharp.Core.fsproj">
diff --git a/src/fsharp/FSharp.LanguageService.Compiler/FSharp.LanguageService.Compiler.fsproj b/src/fsharp/FSharp.LanguageService.Compiler/FSharp.LanguageService.Compiler.fsproj
index d3e9642414c..7223af0163f 100644
--- a/src/fsharp/FSharp.LanguageService.Compiler/FSharp.LanguageService.Compiler.fsproj
+++ b/src/fsharp/FSharp.LanguageService.Compiler/FSharp.LanguageService.Compiler.fsproj
@@ -588,6 +588,10 @@
     <Reference Include="Microsoft.Build.Tasks.Core, Version=$(VisualStudioVersion).0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
       <HintPath>$(FSharpSourcesRoot)\..\packages\Microsoft.VisualFSharp.Msbuild.15.0.1.0.1\lib\net45\Microsoft.Build.Tasks.Core.dll</HintPath>
     </Reference>
+    <Reference Include="Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed">
+      <HintPath>$(FSharpSourcesRoot)\..\packages\Newtonsoft.Json.6.0.8\lib\net45\Newtonsoft.Json.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="Microsoft.DiaSymReader.PortablePdb"><HintPath>..\..\..\packages\Microsoft.DiaSymReader.PortablePdb.1.1.0\lib\portable-net45+win8\Microsoft.DiaSymReader.PortablePdb.dll</HintPath></Reference>
     <Reference Include="Microsoft.DiaSymReader"><HintPath>..\..\..\packages\Microsoft.DiaSymReader.1.0.8\lib\portable-net45+win8\Microsoft.DiaSymReader.dll</HintPath></Reference>
     <Reference Include="System.Reflection.Metadata"><HintPath>..\..\..\packages\System.Reflection.Metadata.1.4.1-beta-24227-04\lib\portable-net45+win8\System.Reflection.Metadata.dll</HintPath></Reference>
diff --git a/tests/fsharpqa/testenv/src/FSharp.Compiler.Hosted/FSharp.Compiler.Hosted.fsproj b/tests/fsharpqa/testenv/src/FSharp.Compiler.Hosted/FSharp.Compiler.Hosted.fsproj
index 477499331da..7833e6d658f 100644
--- a/tests/fsharpqa/testenv/src/FSharp.Compiler.Hosted/FSharp.Compiler.Hosted.fsproj
+++ b/tests/fsharpqa/testenv/src/FSharp.Compiler.Hosted/FSharp.Compiler.Hosted.fsproj
@@ -70,6 +70,7 @@
       <FSharpCoreOptSigFiles Include="$(OpenDrop)\FSharp.Core.xml" />
     </ItemGroup>
 
+    <Copy SourceFiles="@(FSharpCoreOptSigFiles)" DestinationFolder="$(OutputPath)" />
     <Copy SourceFiles="@(FSharpCoreOptSigFiles)" DestinationFolder="$(OutputPath)" SkipUnchangedFiles="true" />
   </Target>
 </Project>
\ No newline at end of file
diff --git a/tests/fsharpqa/testenv/src/HostedCompilerServer/HostedCompilerServer.fsproj b/tests/fsharpqa/testenv/src/HostedCompilerServer/HostedCompilerServer.fsproj
index 4230d157c51..b7a60f89cfa 100644
--- a/tests/fsharpqa/testenv/src/HostedCompilerServer/HostedCompilerServer.fsproj
+++ b/tests/fsharpqa/testenv/src/HostedCompilerServer/HostedCompilerServer.fsproj
@@ -41,6 +41,7 @@
     <None Include="App.config" />
   </ItemGroup>
   <ItemGroup>
+    <ProjectReference Include="..\FSharp.Compiler.Hosted\FSharp.Compiler.Hosted.fsproj"/>
     <ProjectReference Include="..\FSharp.Compiler.Hosted\FSharp.Compiler.Hosted.fsproj">
       <Project>{4fae092e-5366-43f5-85fa-71eaf66fa4a8}</Project>
       <Name>FSharp.Core</Name>