diff --git a/build/agalib_bagn.vcxproj.filters b/build/agalib_bagn.vcxproj.filters
index 69bbc9993..bc3dccb90 100644
--- a/build/agalib_bagn.vcxproj.filters
+++ b/build/agalib_bagn.vcxproj.filters
@@ -47,6 +47,9 @@
     <MskCompiler Include="..\src\include\bagn010.uml">
       <Filter>Mask</Filter>
     </MskCompiler>
+    <MskCompiler Include="..\src\include\bagn011.uml">
+      <Filter>Mask</Filter>
+    </MskCompiler>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\src\include\bagn001a.h">