diff --git a/polymer/eduke32/eduke32.vcxproj b/polymer/eduke32/eduke32.vcxproj
index 69e4d2f58..85149fa62 100644
--- a/polymer/eduke32/eduke32.vcxproj
+++ b/polymer/eduke32/eduke32.vcxproj
@@ -174,6 +174,7 @@
     <ClInclude Include="source\lunatic\lunatic_m32.h" />
     <ClInclude Include="source\m32def.h" />
     <ClInclude Include="source\menus.h" />
+    <ClInclude Include="source\mpu401.h" />
     <ClInclude Include="source\net.h" />
     <ClInclude Include="source\player.h" />
     <ClInclude Include="source\premap.h" />
@@ -181,6 +182,7 @@
     <ClInclude Include="source\savegame.h" />
     <ClInclude Include="source\sector.h" />
     <ClInclude Include="source\_functio.h" />
+    <ClInclude Include="source\_midi.h" />
     <ClInclude Include="source\_rts.h" />
     <ClInclude Include="source\config.h" />
     <ClInclude Include="source\duke3d.h" />
diff --git a/polymer/eduke32/eduke32.vcxproj.filters b/polymer/eduke32/eduke32.vcxproj.filters
index 023d76db1..6839df1ab 100644
--- a/polymer/eduke32/eduke32.vcxproj.filters
+++ b/polymer/eduke32/eduke32.vcxproj.filters
@@ -504,6 +504,9 @@
     <ClInclude Include="build\include\md4.h">
       <Filter>build\headers</Filter>
     </ClInclude>
+    <ClInclude Include="source\mpu401.h">
+      <Filter>eduke32\headers</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="build\src\a-c.c">