diff --git a/visualc/vngspice.vcxproj b/visualc/vngspice.vcxproj
index 7e4b147ab..255554700 100644
--- a/visualc/vngspice.vcxproj
+++ b/visualc/vngspice.vcxproj
@@ -1348,11 +1348,6 @@
     <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>
@@ -1640,7 +1635,6 @@
     <ClCompile Include="..\src\maths\poly\polyfit.c" />
     <ClCompile Include="..\src\maths\sparse\spalloc.c" />
     <ClCompile Include="..\src\maths\sparse\spbuild.c" />
-    <ClCompile Include="..\src\maths\sparse\spCSC.c" />
     <ClCompile Include="..\src\maths\sparse\spextra.c" />
     <ClCompile Include="..\src\maths\sparse\spfactor.c" />
     <ClCompile Include="..\src\maths\sparse\spoutput.c" />