diff --git a/src/OmniSharp.Roslyn.CSharp/OmniSharp.Roslyn.CSharp.csproj b/src/OmniSharp.Roslyn.CSharp/OmniSharp.Roslyn.CSharp.csproj
index ab0ee9ed62..5e8555efba 100644
--- a/src/OmniSharp.Roslyn.CSharp/OmniSharp.Roslyn.CSharp.csproj
+++ b/src/OmniSharp.Roslyn.CSharp/OmniSharp.Roslyn.CSharp.csproj
@@ -6,16 +6,15 @@
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
-    <LangVersion>latest</LangVersion>
+    <LangVersion>7.1</LangVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
-    <LangVersion>latest</LangVersion>
+    <LangVersion>7.1</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>
     <ProjectReference Include="..\OmniSharp.Abstractions\OmniSharp.Abstractions.csproj" />
-    <ProjectReference Include="..\OmniSharp.Cake\OmniSharp.Cake.csproj" />
     <ProjectReference Include="..\OmniSharp.Roslyn\OmniSharp.Roslyn.csproj" />
   </ItemGroup>
 
diff --git a/src/OmniSharp.Roslyn.CSharp/Services/Signatures/SignatureHelpService.cs b/src/OmniSharp.Roslyn.CSharp/Services/Signatures/SignatureHelpService.cs
index 0757c72565..2f83ac3f00 100644
--- a/src/OmniSharp.Roslyn.CSharp/Services/Signatures/SignatureHelpService.cs
+++ b/src/OmniSharp.Roslyn.CSharp/Services/Signatures/SignatureHelpService.cs
@@ -6,11 +6,9 @@
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Text;
-using Microsoft.CodeAnalysis.LanguageServices;
 using OmniSharp.Mef;
 using OmniSharp.Models;
 using OmniSharp.Models.SignatureHelp;
-using System;
 
 
 namespace OmniSharp.Roslyn.CSharp.Services.Signatures