diff --git a/solution/tc_project_app/tc_project_app.plcproj b/solution/tc_project_app/tc_project_app.plcproj
index 10ff279..b81a859 100644
--- a/solution/tc_project_app/tc_project_app.plcproj
+++ b/solution/tc_project_app/tc_project_app.plcproj
@@ -45,6 +45,9 @@
     <Compile Include="tc_mca_std_lib\DUTs\ST_AxisInputs.TcDUT">
       <SubType>Code</SubType>
     </Compile>
+    <Compile Include="tc_mca_std_lib\DUTs\ST_AxisPersistent.TcDUT">
+      <SubType>Code</SubType>
+    </Compile>
     <Compile Include="tc_mca_std_lib\DUTs\ST_GearAxis.TcDUT">
       <SubType>Code</SubType>
     </Compile>