diff --git a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
index 07fb3f1ede..64328b3723 100644
--- a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
+++ b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
@@ -357,6 +357,7 @@
     <Compile Include="Consoles\Atari\A7800Hawk\A7800HawkControllerDeck.cs" />
     <Compile Include="Consoles\Atari\A7800Hawk\A7800HawkControllers.cs" />
     <Compile Include="Consoles\Atari\A7800Hawk\Mappers\MapperDefault.cs" />
+		<Compile Include="Consoles\Atari\A7800Hawk\Mappers\MapperSG.cs" />
     <Compile Include="Consoles\Atari\A7800Hawk\Mappers\MapperBase.cs" />
     <Compile Include="Consoles\Atari\A7800Hawk\MemoryMap.cs">
       <DependentUpon>A7800Hawk.cs</DependentUpon>
@@ -1326,4 +1327,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
\ No newline at end of file
+</Project>