diff --git a/gencpp.vcxproj b/gencpp.vcxproj
index f70ea67..957f357 100644
--- a/gencpp.vcxproj
+++ b/gencpp.vcxproj
@@ -176,6 +176,7 @@
     <ClCompile Include="project\components\ast_case_macros.cpp" />
     <ClCompile Include="project\components\interface.cpp" />
     <ClCompile Include="project\components\interface.parsing.cpp" />
+    <ClCompile Include="project\components\interface.untyped.cpp" />
     <ClCompile Include="project\components\interface.upfront.cpp" />
     <ClCompile Include="project\components\src_start.cpp" />
     <ClCompile Include="project\components\static_data.cpp" />
diff --git a/gencpp.vcxproj.filters b/gencpp.vcxproj.filters
index b474c34..cd9c640 100644
--- a/gencpp.vcxproj.filters
+++ b/gencpp.vcxproj.filters
@@ -126,6 +126,9 @@
     <ClCompile Include="test\validate_bootstrap.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="project\components\interface.untyped.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="project\gen.hpp">