diff --git a/win32/monsterz.vcxproj b/win32/monsterz.vcxproj
index bc263909..d32b7e69 100644
--- a/win32/monsterz.vcxproj
+++ b/win32/monsterz.vcxproj
@@ -12,6 +12,7 @@
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\monsterz\board.h" />
+    <ClInclude Include="..\monsterz\interface.h" />
     <ClInclude Include="..\monsterz\mash.h" />
     <ClInclude Include="..\monsterz\monsterz.h" />
     <ClInclude Include="..\monsterz\piece.h" />
@@ -49,6 +50,7 @@
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\monsterz\board.cpp" />
+    <ClCompile Include="..\monsterz\interface.cpp" />
     <ClCompile Include="..\monsterz\mash.cpp" />
     <ClCompile Include="..\monsterz\monsterz.cpp" />
     <ClCompile Include="..\monsterz\piece.cpp" />
diff --git a/win32/monsterz.vcxproj.filters b/win32/monsterz.vcxproj.filters
index 3a3bf25a..af99bcba 100644
--- a/win32/monsterz.vcxproj.filters
+++ b/win32/monsterz.vcxproj.filters
@@ -88,6 +88,7 @@
       <Filter>lolengine</Filter>
     </ClInclude>
     <ClInclude Include="..\monsterz\board.h" />
+    <ClInclude Include="..\monsterz\interface.h" />
     <ClInclude Include="..\monsterz\piece.h" />
     <ClInclude Include="..\monsterz\title.h" />
     <ClInclude Include="..\src\sampler.h">
@@ -173,6 +174,7 @@
       <Filter>lolengine</Filter>
     </ClCompile>
     <ClCompile Include="..\monsterz\board.cpp" />
+    <ClCompile Include="..\monsterz\interface.cpp" />
     <ClCompile Include="..\monsterz\monsterz.cpp" />
     <ClCompile Include="..\monsterz\piece.cpp" />
     <ClCompile Include="..\monsterz\title.cpp" />