diff --git a/solution/tc_project_app/tc_project_app.plcproj b/solution/tc_project_app/tc_project_app.plcproj
index c77b28a..913351a 100644
--- a/solution/tc_project_app/tc_project_app.plcproj
+++ b/solution/tc_project_app/tc_project_app.plcproj
@@ -73,6 +73,9 @@
     <Compile Include="tc_mca_std_lib\DUTs\Axis_Structures\ST_AxisStruct.TcDUT">
       <SubType>Code</SubType>
     </Compile>
+    <Compile Include="tc_mca_std_lib\DUTs\Axis_Structures\ST_BacklashConfig.TcDUT">
+      <SubType>Code</SubType>
+    </Compile>
     <Compile Include="tc_mca_std_lib\DUTs\Axis_Structures\ST_GearAxis.TcDUT">
       <SubType>Code</SubType>
     </Compile>