diff --git a/visualc/sharedspice.vcxproj b/visualc/sharedspice.vcxproj
index fe2242d34..4cec0f8d1 100644
--- a/visualc/sharedspice.vcxproj
+++ b/visualc/sharedspice.vcxproj
@@ -1226,6 +1226,7 @@
     <ClCompile Include="..\src\spicelib\analysis\ninteg.c" />
     <ClCompile Include="..\src\spicelib\analysis\noisean.c" />
     <ClCompile Include="..\src\spicelib\analysis\nsetparm.c" />
+    <ClCompile Include="..\src\spicelib\analysis\optran.c" />
     <ClCompile Include="..\src\spicelib\analysis\pssaskq.c" />
     <ClCompile Include="..\src\spicelib\analysis\pssinit.c" />
     <ClCompile Include="..\src\spicelib\analysis\psssetp.c" />
diff --git a/visualc/vngspice-fftw.vcxproj b/visualc/vngspice-fftw.vcxproj
index a8ac05b31..ba883a056 100644
--- a/visualc/vngspice-fftw.vcxproj
+++ b/visualc/vngspice-fftw.vcxproj
@@ -1320,11 +1320,6 @@ lib /machine:x64 /def:..\..\fftw-3.3-dll64\libfftw3-3.def /out:$(IntDir)libfftw3
     <ClInclude Include="resource.h" />
   </ItemGroup>
   <ItemGroup>
-    <CustomBuild Include="..\src\frontend\parse-bison.y;..\src\spicelib\parser\inpptree-parser.y">
-      <Message>invoke win_bison.exe for %(Identity)</Message>
-      <Command>..\..\flex-bison\win_bison.exe --output=.\tmp-bison\%(Filename).c --defines=.\tmp-bison\%(Filename).h %(Identity) || exit 1</Command>
-      <Outputs>.\tmp-bison\%(Filename).c;.\tmp-bison\%(Filename).h</Outputs>
-    </CustomBuild>
     <None Include="..\src\xspice\icm\objects.inc" />
   </ItemGroup>
   <ItemGroup>
@@ -1676,6 +1671,7 @@ lib /machine:x64 /def:..\..\fftw-3.3-dll64\libfftw3-3.def /out:$(IntDir)libfftw3
     <ClCompile Include="..\src\spicelib\analysis\ninteg.c" />
     <ClCompile Include="..\src\spicelib\analysis\noisean.c" />
     <ClCompile Include="..\src\spicelib\analysis\nsetparm.c" />
+    <ClCompile Include="..\src\spicelib\analysis\optran.c" />
     <ClCompile Include="..\src\spicelib\analysis\pssaskq.c" />
     <ClCompile Include="..\src\spicelib\analysis\pssinit.c" />
     <ClCompile Include="..\src\spicelib\analysis\psssetp.c" />
@@ -2673,6 +2669,18 @@ lib /machine:x64 /def:..\..\fftw-3.3-dll64\libfftw3-3.def /out:$(IntDir)libfftw3
   <ItemGroup>
     <ResourceCompile Include="vngspice.rc" />
   </ItemGroup>
+  <ItemGroup>
+    <CustomBuild Include="..\src\frontend\parse-bison.y">
+      <Message>invoke win_bison.exe for %(Identity)</Message>
+      <Command>..\..\flex-bison\win_bison.exe --output=.\tmp-bison\%(Filename).c --defines=.\tmp-bison\%(Filename).h %(Identity) || exit 1</Command>
+      <Outputs>.\tmp-bison\%(Filename).c;.\tmp-bison\%(Filename).h</Outputs>
+    </CustomBuild>
+    <CustomBuild Include="..\src\spicelib\parser\inpptree-parser.y">
+      <Message>invoke win_bison.exe for %(Identity)</Message>
+      <Command>..\..\flex-bison\win_bison.exe --output=.\tmp-bison\%(Filename).c --defines=.\tmp-bison\%(Filename).h %(Identity) || exit 1</Command>
+      <Outputs>.\tmp-bison\%(Filename).c;.\tmp-bison\%(Filename).h</Outputs>
+    </CustomBuild>
+  </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>