diff --git a/src/csharp/Grpc.Core/Common.csproj.include b/src/csharp/Grpc.Core/Common.csproj.include
index 3b1bec2d55f..19e7240f443 100755
--- a/src/csharp/Grpc.Core/Common.csproj.include
+++ b/src/csharp/Grpc.Core/Common.csproj.include
@@ -19,10 +19,8 @@
     <PublicSign Condition=" '$(OS)' != 'Windows_NT' ">true</PublicSign>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(OS)' != 'Windows_NT'">
-    <!-- Workaround for https://github.com/dotnet/sdk/issues/335 -->
-    <FrameworkPathOverride Condition="Exists('/usr/lib/mono/4.5-api')">/usr/lib/mono/4.5-api</FrameworkPathOverride>
-    <FrameworkPathOverride Condition="Exists('/usr/local/lib/mono/4.5-api')">/usr/local/lib/mono/4.5-api</FrameworkPathOverride>
-    <FrameworkPathOverride Condition="Exists('/Library/Frameworks/Mono.framework/Versions/Current/lib/mono/4.5-api')">/Library/Frameworks/Mono.framework/Versions/Current/lib/mono/4.5-api</FrameworkPathOverride>
-  </PropertyGroup>
+  <!-- Needed for the net45 build to work on Unix. See https://github.com/dotnet/designs/pull/33 -->
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0-preview.2" PrivateAssets="All" />
+  </ItemGroup>
 </Project>
diff --git a/src/csharp/Grpc.Tools.Tests/Grpc.Tools.Tests.csproj b/src/csharp/Grpc.Tools.Tests/Grpc.Tools.Tests.csproj
index 7ad2ce21694..6df929cb2c0 100644
--- a/src/csharp/Grpc.Tools.Tests/Grpc.Tools.Tests.csproj
+++ b/src/csharp/Grpc.Tools.Tests/Grpc.Tools.Tests.csproj
@@ -7,17 +7,10 @@
 
   <Import Project="..\Grpc.Core\SourceLink.csproj.include" />
 
-  <!-- This is copied verbatim from Grpc.Core/Common.csproj.include. Other settings
-       in that file conflict with the intent of this build, as it cannot be signed,
-       and may not compile Grpc.Core/Version.cs, as that file references constants
-       in Grpc.Core.dll.
-       TODO(kkm): Refactor imports. -->
-  <PropertyGroup Condition=" '$(OS)' != 'Windows_NT' and '$(MSBuildRuntimeType)' == 'Core' ">
-    <!-- Use Mono reference assemblies in SDK build: https://github.com/dotnet/sdk/issues/335 -->
-    <FrameworkPathOverride Condition="Exists('/usr/lib/mono/4.5-api')">/usr/lib/mono/4.5-api</FrameworkPathOverride>
-    <FrameworkPathOverride Condition="Exists('/usr/local/lib/mono/4.5-api')">/usr/local/lib/mono/4.5-api</FrameworkPathOverride>
-    <FrameworkPathOverride Condition="Exists('/Library/Frameworks/Mono.framework/Versions/Current/lib/mono/4.5-api')">/Library/Frameworks/Mono.framework/Versions/Current/lib/mono/4.5-api</FrameworkPathOverride>
-  </PropertyGroup>
+  <!-- Needed for the net45 build to work on Unix. See https://github.com/dotnet/designs/pull/33 -->
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0-preview.2" PrivateAssets="All" />
+  </ItemGroup>
 
   <ItemGroup>
     <ProjectReference Include="..\Grpc.Tools\Grpc.Tools.csproj" />
diff --git a/src/csharp/Grpc.Tools/Grpc.Tools.csproj b/src/csharp/Grpc.Tools/Grpc.Tools.csproj
index d09d97d1397..40034e9b20a 100644
--- a/src/csharp/Grpc.Tools/Grpc.Tools.csproj
+++ b/src/csharp/Grpc.Tools/Grpc.Tools.csproj
@@ -7,17 +7,10 @@
     <TargetFrameworks>net45;netstandard1.3</TargetFrameworks>
   </PropertyGroup>
 
-  <!-- This is copied verbatim from Grpc.Core/Common.csproj.include. Other settings
-       in that file conflict with the intent of this build, as it cannot be signed,
-       and may not compile Grpc.Core/Version.cs, as that file references constants
-       in Grpc.Core.dll.
-       TODO(kkm): Refactor imports. -->
-  <PropertyGroup Condition=" '$(OS)' != 'Windows_NT' and '$(MSBuildRuntimeType)' == 'Core' ">
-    <!-- Use Mono reference assemblies in SDK build: https://github.com/dotnet/sdk/issues/335 -->
-    <FrameworkPathOverride Condition="Exists('/usr/lib/mono/4.5-api')">/usr/lib/mono/4.5-api</FrameworkPathOverride>
-    <FrameworkPathOverride Condition="Exists('/usr/local/lib/mono/4.5-api')">/usr/local/lib/mono/4.5-api</FrameworkPathOverride>
-    <FrameworkPathOverride Condition="Exists('/Library/Frameworks/Mono.framework/Versions/Current/lib/mono/4.5-api')">/Library/Frameworks/Mono.framework/Versions/Current/lib/mono/4.5-api</FrameworkPathOverride>
-  </PropertyGroup>
+  <!-- Needed for the net45 build to work on Unix. See https://github.com/dotnet/designs/pull/33 -->
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0-preview.2" PrivateAssets="All" />
+  </ItemGroup>
 
   <PropertyGroup Label="Asset root folders. TODO(kkm): Change with package separation.">
     <!-- TODO(kkm): Rework whole section when splitting packages.  -->