Think I figured out what is wrong.

Author: gertjvr

src/Serilog.Extensions.Logging/Serilog.Extensions.Logging.csproj

@@ -30,13 +30,15 @@
     <Reference Include="System" />
     <Reference Include="Microsoft.CSharp" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="1.0.0" />
+    <Compile Remove="SerilogLoggerServicesExtensions.cs" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net46' ">
     <Reference Include="System.Runtime" />
     <Reference Include="System" />
     <Reference Include="Microsoft.CSharp" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="1.0.0" />
+    <Compile Remove="SerilogLoggerServicesExtensions.cs" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.3' ">