diff --git a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
index f8cad71c73..537435d739 100644
--- a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
+++ b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
@@ -258,14 +258,6 @@
     <Compile Include="Computers\Commodore64\User\UserPortDevice.cs" />
     <Compile Include="Computers\SinclairSpectrum\Hardware\AY38912.cs" />
     <Compile Include="Computers\SinclairSpectrum\Hardware\Buzzer.cs" />
-    <Compile Include="Computers\SinclairSpectrum\Hardware\CassetteDevice\CassetteDevice.cs" />
-    <Compile Include="Computers\SinclairSpectrum\Hardware\CassetteDevice\Datacorder.cs" />
-    <Compile Include="Computers\SinclairSpectrum\Hardware\CassetteDevice\MicPulseType.cs" />
-    <Compile Include="Computers\SinclairSpectrum\Hardware\CassetteDevice\PlayPhase.cs" />
-    <Compile Include="Computers\SinclairSpectrum\Hardware\CassetteDevice\SavePhase.cs" />
-    <Compile Include="Computers\SinclairSpectrum\Hardware\CassetteDevice\SpectrumTapeHeader.cs" />
-    <Compile Include="Computers\SinclairSpectrum\Hardware\CassetteDevice\TapeFormat.cs" />
-    <Compile Include="Computers\SinclairSpectrum\Hardware\CassetteDevice\TapeOperationMode.cs" />
     <Compile Include="Computers\SinclairSpectrum\Hardware\DefaultTapeProvider.cs" />
     <Compile Include="Computers\SinclairSpectrum\Hardware\Interfaces\IKeyboard.cs" />
     <Compile Include="Computers\SinclairSpectrum\Hardware\Interfaces\ISaveToTapeProvider.cs" />