THRIFT-5479 Add net 6 support
diff --git a/test/netstd/Client/Client.csproj b/test/netstd/Client/Client.csproj
index c7d5349..859297f 100644
--- a/test/netstd/Client/Client.csproj
+++ b/test/netstd/Client/Client.csproj
@@ -31,6 +31,7 @@
     <GenerateAssemblyCompanyAttribute>false</GenerateAssemblyCompanyAttribute>
     <GenerateAssemblyProductAttribute>false</GenerateAssemblyProductAttribute>
     <GenerateAssemblyCopyrightAttribute>false</GenerateAssemblyCopyrightAttribute>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>