diff --git a/BizHawk.Emulation/BizHawk.Emulation.csproj b/BizHawk.Emulation/BizHawk.Emulation.csproj
index 4144644e46..5b3ff6b5a8 100644
--- a/BizHawk.Emulation/BizHawk.Emulation.csproj
+++ b/BizHawk.Emulation/BizHawk.Emulation.csproj
@@ -190,6 +190,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper189.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper191.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper192.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper205.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\MMC3.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\NES-QJ.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\TQROM.cs" />