diff --git a/NSspi/NSspi.csproj b/NSspi/NSspi.csproj
index 9602a88..7a0afcc 100644
--- a/NSspi/NSspi.csproj
+++ b/NSspi/NSspi.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFrameworks>netstandard2.0;net40</TargetFrameworks>
     <RootNamespace>NSspi</RootNamespace>
     <AssemblyName>NSspi</AssemblyName>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
@@ -10,7 +10,7 @@
     <Version>0.2.1.0</Version>
   </PropertyGroup>
 
-  <ItemGroup>
+  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
     <PackageReference Include="System.Security.Principal.Windows" Version="4.5.1" />
   </ItemGroup>
 </Project>
\ No newline at end of file