diff --git a/src/da65.vcxproj b/src/da65.vcxproj
index 7810844dc..2695edc08 100644
--- a/src/da65.vcxproj
+++ b/src/da65.vcxproj
@@ -86,6 +86,7 @@
     <ClCompile Include="da65\infofile.c" />
     <ClCompile Include="da65\labels.c" />
     <ClCompile Include="da65\main.c" />
+    <ClCompile Include="da65\opc4510.c" />
     <ClCompile Include="da65\opc6502.c" />
     <ClCompile Include="da65\opc6502x.c" />
     <ClCompile Include="da65\opc65816.c" />
@@ -109,6 +110,7 @@
     <ClInclude Include="da65\handler.h" />
     <ClInclude Include="da65\infofile.h" />
     <ClInclude Include="da65\labels.h" />
+    <ClInclude Include="da65\opc4510.h" />
     <ClInclude Include="da65\opc6502.h" />
     <ClInclude Include="da65\opc6502x.h" />
     <ClInclude Include="da65\opc65816.h" />