diff --git a/Capnp.Net.Runtime.Tests/Capnp.Net.Runtime.Tests.Std20.csproj b/Capnp.Net.Runtime.Tests/Capnp.Net.Runtime.Tests.Std20.csproj
index d722dd3..2f47c80 100644
--- a/Capnp.Net.Runtime.Tests/Capnp.Net.Runtime.Tests.Std20.csproj
+++ b/Capnp.Net.Runtime.Tests/Capnp.Net.Runtime.Tests.Std20.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.2</TargetFramework>
+    <TargetFramework>net471</TargetFramework>
 
     <IsPackable>false</IsPackable>
 
@@ -22,6 +22,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="1.4.0" />
     <PackageReference Include="MSTest.TestFramework" Version="1.4.0" />
+    <PackageReference Include="System.Threading.Tasks.Dataflow" Version="4.10.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/Capnp.Net.Runtime.Tests/TcpRpcInterop.cs b/Capnp.Net.Runtime.Tests/TcpRpcInterop.cs
index 5043133..3114d48 100644
--- a/Capnp.Net.Runtime.Tests/TcpRpcInterop.cs
+++ b/Capnp.Net.Runtime.Tests/TcpRpcInterop.cs
@@ -50,6 +50,7 @@ namespace Capnp.Net.Runtime.Tests
             string arguments = $"{whichTest} 127.0.0.1:{TcpPort}";
             var startInfo = new ProcessStartInfo(path, arguments)
             {
+                UseShellExecute = false,
                 RedirectStandardError = true,
                 RedirectStandardOutput = true,
                 RedirectStandardInput = true