diff --git a/TBF/TBF.csproj b/TBF/TBF.csproj
index 760ee7a83..9cc65d4a8 100644
--- a/TBF/TBF.csproj
+++ b/TBF/TBF.csproj
@@ -1308,6 +1308,7 @@
     <Compile Include="Rig\RegisterReaders\PoseidonCmdStartStop\PoseidonCfg.cs" />
     <Compile Include="Rig\RegisterReaders\PoseidonCmdStartStop\PoseidonProcParams.cs" />
     <Compile Include="Rig\RegisterReaders\PoseidonCmdStartStop\PoseidonReader.cs" />
+    <Compile Include="Rig\RegisterReaders\PoseidonCmdStartStop\ProcessExtensions.cs" />
     <Compile Include="Rig\RegisterReaders\PoseidonCmdStartStop\ScopedLoggerFactory.cs" />
     <Compile Include="Rig\RegisterReaders\PoseidonCmdStartStop\SerialPortData.cs" />
     <Compile Include="Rig\RegisterReaders\PoseidonReader\communication\CalibrationStruct.cs" />