grpc++_unsecure shouldn't depend on grpc but on grpc_unsecure.
diff --git a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
index c33c665..d031a3d 100644
--- a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
@@ -489,6 +489,9 @@
     <ClInclude Include="$(SolutionDir)\..\include\grpc\grpc_posix.h">
       <Filter>include\grpc</Filter>
     </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\include\grpc\grpc_security_constants.h">
+      <Filter>include\grpc</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\include\grpc\status.h">
       <Filter>include\grpc</Filter>
     </ClInclude>