Fix build
diff --git a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
index 8edfcd7..32c2bd7 100644
--- a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
@@ -872,6 +872,9 @@
<ClInclude Include="$(SolutionDir)\..\src\core\lib\slice\percent_encoding.h">
<Filter>src\core\lib\slice</Filter>
</ClInclude>
+ <ClInclude Include="$(SolutionDir)\..\src\core\lib\slice\slice_internal.h">
+ <Filter>src\core\lib\slice</Filter>
+ </ClInclude>
<ClInclude Include="$(SolutionDir)\..\src\core\lib\slice\slice_string_helpers.h">
<Filter>src\core\lib\slice</Filter>
</ClInclude>