diff --git a/Aaru.Checksums.csproj b/Aaru.Checksums.csproj
index cc44fb3..3f782a0 100644
--- a/Aaru.Checksums.csproj
+++ b/Aaru.Checksums.csproj
@@ -54,9 +54,6 @@
     <WarningLevel>4</WarningLevel>
     <ConsolePause>false</ConsolePause>
   </PropertyGroup>
-  <ItemGroup>
-    <Reference Include="System" />
-  </ItemGroup>
   <ItemGroup>
     <Compile Include="Adler32\neon.cs" />
     <Compile Include="Adler32\ssse3.cs" />