diff --git a/src/Microsoft.AspNetCore.Razor.Evolution/Microsoft.AspNetCore.Razor.Evolution.csproj b/src/Microsoft.AspNetCore.Razor.Evolution/Microsoft.AspNetCore.Razor.Evolution.csproj
index e416ecdeee..b958fe5357 100644
--- a/src/Microsoft.AspNetCore.Razor.Evolution/Microsoft.AspNetCore.Razor.Evolution.csproj
+++ b/src/Microsoft.AspNetCore.Razor.Evolution/Microsoft.AspNetCore.Razor.Evolution.csproj
@@ -19,11 +19,6 @@
     <!-- <PackageReference Include="Microsoft.Extensions.HashCodeCombiner.Sources" Version="1.2.0-*" PrivateAssets="All" /> -->
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">
-    <Reference Include="System" />
-    <Reference Include="Microsoft.CSharp" />
-  </ItemGroup>
-
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.3' ">
     <PackageReference Include="NETStandard.Library" Version="1.6.2-*" />
   </ItemGroup>
diff --git a/src/Microsoft.AspNetCore.Razor.Runtime/Microsoft.AspNetCore.Razor.Runtime.csproj b/src/Microsoft.AspNetCore.Razor.Runtime/Microsoft.AspNetCore.Razor.Runtime.csproj
index 0e345df1a0..a5ada1b7a2 100644
--- a/src/Microsoft.AspNetCore.Razor.Runtime/Microsoft.AspNetCore.Razor.Runtime.csproj
+++ b/src/Microsoft.AspNetCore.Razor.Runtime/Microsoft.AspNetCore.Razor.Runtime.csproj
@@ -33,15 +33,6 @@ Microsoft.AspNetCore.Razor.TagHelpers.ITagHelper</Description>
     <PackageReference Include="Microsoft.Extensions.TaskCache.Sources" Version="1.2.0-*" PrivateAssets="All" /> -->
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">
-    <Reference Include="System.Runtime" />
-    <Reference Include="System.IO" />
-    <Reference Include="System.Xml" />
-    <Reference Include="System.Xml.Linq" />
-    <Reference Include="System" />
-    <Reference Include="Microsoft.CSharp" />
-  </ItemGroup>
-
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.5' ">
     <PackageReference Include="System.Reflection.TypeExtensions" Version="4.4.0-*" />
   </ItemGroup>
diff --git a/src/Microsoft.AspNetCore.Razor/Microsoft.AspNetCore.Razor.csproj b/src/Microsoft.AspNetCore.Razor/Microsoft.AspNetCore.Razor.csproj
index 068d48a10f..99dc6d4cd9 100644
--- a/src/Microsoft.AspNetCore.Razor/Microsoft.AspNetCore.Razor.csproj
+++ b/src/Microsoft.AspNetCore.Razor/Microsoft.AspNetCore.Razor.csproj
@@ -20,11 +20,6 @@
     <PackageReference Include="NETStandard.Library" Version="1.6.2-*" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">
-    <Reference Include="System" />
-    <Reference Include="Microsoft.CSharp" />
-  </ItemGroup>
-
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.3' ">
     <PackageReference Include="System.Threading.Thread" Version="4.4.0-*" />
   </ItemGroup>
diff --git a/test/Microsoft.AspNetCore.Razor.Evolution.Test/Microsoft.AspNetCore.Razor.Evolution.Test.csproj b/test/Microsoft.AspNetCore.Razor.Evolution.Test/Microsoft.AspNetCore.Razor.Evolution.Test.csproj
index 883b86080b..e4602606db 100644
--- a/test/Microsoft.AspNetCore.Razor.Evolution.Test/Microsoft.AspNetCore.Razor.Evolution.Test.csproj
+++ b/test/Microsoft.AspNetCore.Razor.Evolution.Test/Microsoft.AspNetCore.Razor.Evolution.Test.csproj
@@ -22,10 +22,4 @@
   <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp1.1' ">
     <PackageReference Include="Microsoft.NETCore.App" Version="1.2.0-*" />
   </ItemGroup>
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">
-    <Reference Include="System.Runtime" />
-    <Reference Include="System.Threading.Tasks" />
-    <Reference Include="System" />
-    <Reference Include="Microsoft.CSharp" />
-  </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/test/Microsoft.AspNetCore.Razor.Runtime.Test/Microsoft.AspNetCore.Razor.Runtime.Test.csproj b/test/Microsoft.AspNetCore.Razor.Runtime.Test/Microsoft.AspNetCore.Razor.Runtime.Test.csproj
index f9d7b706f7..36e8b6225d 100644
--- a/test/Microsoft.AspNetCore.Razor.Runtime.Test/Microsoft.AspNetCore.Razor.Runtime.Test.csproj
+++ b/test/Microsoft.AspNetCore.Razor.Runtime.Test/Microsoft.AspNetCore.Razor.Runtime.Test.csproj
@@ -19,24 +19,6 @@
     </ProjectReference>
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">
-    <Reference Include="System.Runtime">
-      <FromP2P>true</FromP2P>
-    </Reference>
-    <Reference Include="System.IO">
-      <FromP2P>true</FromP2P>
-    </Reference>
-    <Reference Include="System.Threading.Tasks" />
-    <Reference Include="System.Xml">
-      <FromP2P>true</FromP2P>
-    </Reference>
-    <Reference Include="System.Xml.Linq">
-      <FromP2P>true</FromP2P>
-    </Reference>
-    <Reference Include="System" />
-    <Reference Include="Microsoft.CSharp" />
-  </ItemGroup>
-
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0-preview-20161123-03" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.2.0-beta4-build1194" />
diff --git a/test/Microsoft.AspNetCore.Razor.Test/Microsoft.AspNetCore.Razor.Test.csproj b/test/Microsoft.AspNetCore.Razor.Test/Microsoft.AspNetCore.Razor.Test.csproj
index fbfdeeb324..b49b61fce7 100644
--- a/test/Microsoft.AspNetCore.Razor.Test/Microsoft.AspNetCore.Razor.Test.csproj
+++ b/test/Microsoft.AspNetCore.Razor.Test/Microsoft.AspNetCore.Razor.Test.csproj
@@ -19,24 +19,6 @@
     <ProjectReference Include="..\..\src\Microsoft.AspNetCore.Razor.Runtime\Microsoft.AspNetCore.Razor.Runtime.csproj" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">
-    <Reference Include="System.IO">
-      <FromP2P>true</FromP2P>
-    </Reference>
-    <Reference Include="System.Xml">
-      <FromP2P>true</FromP2P>
-    </Reference>
-    <Reference Include="System.Xml.Linq">
-      <FromP2P>true</FromP2P>
-    </Reference>
-    <Reference Include="System.Runtime">
-      <FromP2P>true</FromP2P>
-    </Reference>
-    <Reference Include="System.Threading.Tasks" />
-    <Reference Include="System" />
-    <Reference Include="Microsoft.CSharp" />
-  </ItemGroup>
-
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0-preview-20161123-03" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.2.0-beta4-build1194" />