compile dtrace stubs
diff --git a/PCbuild/pythoncore.vcxproj.filters b/PCbuild/pythoncore.vcxproj.filters
index e4f98a0..5eb4275 100644
--- a/PCbuild/pythoncore.vcxproj.filters
+++ b/PCbuild/pythoncore.vcxproj.filters
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
     <Filter Include="Include">
@@ -848,6 +848,9 @@
     <ClCompile Include="..\Python\compile.c">
       <Filter>Python</Filter>
     </ClCompile>
+    <ClCompile Include="..\Python\dtrace_stubs.c">
+      <Filter>Python</Filter>
+    </ClCompile>
     <ClCompile Include="..\Python\dynamic_annotations.c">
       <Filter>Python</Filter>
     </ClCompile>