diff --git a/visualc/vngspice.vcxproj b/visualc/vngspice.vcxproj
index 455987b98..76cf3bd4d 100644
--- a/visualc/vngspice.vcxproj
+++ b/visualc/vngspice.vcxproj
@@ -1074,6 +1074,7 @@
     <ClInclude Include="..\src\misc\tilde.h" />
     <ClInclude Include="..\src\misc\util.h" />
     <ClInclude Include="..\src\spicelib\analysis\analysis.h" />
+    <ClInclude Include="..\src\spicelib\analysis\com_optran.h" />
     <ClInclude Include="..\src\spicelib\devices\asrc\asrcdefs.h" />
     <ClInclude Include="..\src\spicelib\devices\asrc\asrcext.h" />
     <ClInclude Include="..\src\spicelib\devices\asrc\asrcinit.h" />