diff --git a/visualc/xspice/analog.vcxproj b/visualc/xspice/analog.vcxproj
index 4c81fd959..222219f72 100644
--- a/visualc/xspice/analog.vcxproj
+++ b/visualc/xspice/analog.vcxproj
@@ -258,6 +258,8 @@
     <ClCompile Include="icm\analog\delay\delay-ifspec.c" />
     <ClCompile Include="icm\analog\xfer\xfer-cfunc.c" />
     <ClCompile Include="icm\analog\xfer\xfer-ifspec.c" />
+    <ClCompile Include="icm\analog\ota\ota-cfunc.c" />
+    <ClCompile Include="icm\analog\ota\ota-ifspec.c" />
     <ClCompile Include="..\..\src\xspice\icm\dlmain.c" />
   </ItemGroup>
   <ItemGroup>
@@ -307,6 +309,8 @@
     <None Include="..\..\src\xspice\icm\analog\delay\ifspec.ifs" />
     <None Include="..\..\src\xspice\icm\analog\xfer\cfunc.mod" />
     <None Include="..\..\src\xspice\icm\analog\xfer\ifspec.ifs" />
+    <None Include="..\..\src\xspice\icm\analog\ota\cfunc.mod" />
+    <None Include="..\..\src\xspice\icm\analog\ota\ifspec.ifs" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\src\include\ngspice\dstring.h" />