diff --git a/OneOf.Extended/OneOf.Extended.csproj b/OneOf.Extended/OneOf.Extended.csproj
index 5dc1f77..fc3d0d8 100644
--- a/OneOf.Extended/OneOf.Extended.csproj
+++ b/OneOf.Extended/OneOf.Extended.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net35;net451;netstandard1.3</TargetFrameworks>
+    <TargetFrameworks>net35;net451;netstandard1.3;netstandard2.0</TargetFrameworks>
     <Authors>Harry McIntyre</Authors>
     <Title>OneOf - Easy Discriminated Unions for c#</Title>
     <Company>Harry McIntyre</Company>
@@ -27,9 +27,13 @@
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard1.3'">
+    <PackageReference Include="System.Net.Http" Version="4.3.4" />
+    <PackageReference Include="System.Text.RegularExpressions" Version="4.3.1" />
+  </ItemGroup>
 
   <ItemGroup>
     <ProjectReference Include="..\OneOf\OneOf.csproj" />
   </ItemGroup>
 
-</Project>
\ No newline at end of file
+</Project>
diff --git a/OneOf/OneOf.csproj b/OneOf/OneOf.csproj
index 4bd8b36..e948776 100644
--- a/OneOf/OneOf.csproj
+++ b/OneOf/OneOf.csproj
@@ -22,6 +22,11 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard1.3'">
+    <PackageReference Include="System.Net.Http" Version="4.3.4" />
+    <PackageReference Include="System.Text.RegularExpressions" Version="4.3.1" />
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
   </ItemGroup>