diff --git a/visualc/sharedspice.vcxproj b/visualc/sharedspice.vcxproj
index 78ef738c9..89bc0fbbe 100644
--- a/visualc/sharedspice.vcxproj
+++ b/visualc/sharedspice.vcxproj
@@ -433,6 +433,7 @@
     <ClInclude Include="..\src\frontend\init.h" />
     <ClInclude Include="..\src\frontend\inp.h" />
     <ClInclude Include="..\src\frontend\inpcom.h" />
+    <ClInclude Include="..\src\frontend\inpcompat.h" />
     <ClInclude Include="..\src\frontend\interp.h" />
     <ClInclude Include="..\src\frontend\linear.h" />
     <ClInclude Include="..\src\frontend\misccoms.h" />
@@ -1045,6 +1046,7 @@
     <ClCompile Include="..\src\frontend\init.c" />
     <ClCompile Include="..\src\frontend\inp.c" />
     <ClCompile Include="..\src\frontend\inpcom.c" />
+    <ClCompile Include="..\src\frontend\inpcompat.c" />
     <ClCompile Include="..\src\frontend\inpc_probe.c" />
     <ClCompile Include="..\src\frontend\interp.c" />
     <ClCompile Include="..\src\frontend\inventory.c" />
diff --git a/visualc/vngspice-fftw.vcxproj b/visualc/vngspice-fftw.vcxproj
index 51576a646..d44b3c013 100644
--- a/visualc/vngspice-fftw.vcxproj
+++ b/visualc/vngspice-fftw.vcxproj
@@ -881,6 +881,7 @@ lib /machine:x64 /def:..\..\fftw-3.3-dll64\libfftw3-3.def /out:$(IntDir)libfftw3
     <ClInclude Include="..\src\frontend\init.h" />
     <ClInclude Include="..\src\frontend\inp.h" />
     <ClInclude Include="..\src\frontend\inpcom.h" />
+    <ClInclude Include="..\src\frontend\inpcompat.h" />
     <ClInclude Include="..\src\frontend\interp.h" />
     <ClInclude Include="..\src\frontend\linear.h" />
     <ClInclude Include="..\src\frontend\misccoms.h" />
@@ -1500,6 +1501,7 @@ lib /machine:x64 /def:..\..\fftw-3.3-dll64\libfftw3-3.def /out:$(IntDir)libfftw3
     <ClCompile Include="..\src\frontend\init.c" />
     <ClCompile Include="..\src\frontend\inp.c" />
     <ClCompile Include="..\src\frontend\inpcom.c" />
+    <ClCompile Include="..\src\frontend\inpcompat.c" />
     <ClCompile Include="..\src\frontend\inpc_probe.c" />
     <ClCompile Include="..\src\frontend\interp.c" />
     <ClCompile Include="..\src\frontend\inventory.c" />
diff --git a/visualc/vngspice.vcxproj b/visualc/vngspice.vcxproj
index 3a951c090..f767965c8 100644
--- a/visualc/vngspice.vcxproj
+++ b/visualc/vngspice.vcxproj
@@ -889,6 +889,7 @@
     <ClInclude Include="..\src\frontend\init.h" />
     <ClInclude Include="..\src\frontend\inp.h" />
     <ClInclude Include="..\src\frontend\inpcom.h" />
+    <ClInclude Include="..\src\frontend\inpcompat.h" />
     <ClInclude Include="..\src\frontend\interp.h" />
     <ClInclude Include="..\src\frontend\linear.h" />
     <ClInclude Include="..\src\frontend\misccoms.h" />
@@ -1507,6 +1508,7 @@
     <ClCompile Include="..\src\frontend\inp.c" />
     <ClCompile Include="..\src\frontend\inpcom.c" />
     <ClCompile Include="..\src\frontend\inpc_probe.c" />
+    <ClCompile Include="..\src\frontend\inpcompat.c" />
     <ClCompile Include="..\src\frontend\interp.c" />
     <ClCompile Include="..\src\frontend\inventory.c" />
     <ClCompile Include="..\src\frontend\linear.c" />