diff --git a/Makefile.pre.in b/Makefile.pre.in
index 870c0e7f69a..02a0b64bb5a 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -943,6 +943,7 @@ PYTHON_HEADERS= \
 		$(srcdir)/Include/objimpl.h \
 		$(OPCODE_H) \
 		$(srcdir)/Include/osdefs.h \
+		$(srcdir)/Include/osmodule.h \
 		$(srcdir)/Include/patchlevel.h \
 		$(srcdir)/Include/pgen.h \
 		$(srcdir)/Include/pgenheaders.h \
diff --git a/PCbuild/pythoncore.vcxproj b/PCbuild/pythoncore.vcxproj
index a29b87dd03f..9dfe9e3f5db 100644
--- a/PCbuild/pythoncore.vcxproj
+++ b/PCbuild/pythoncore.vcxproj
@@ -124,6 +124,7 @@
     <ClInclude Include="..\Include\odictobject.h" />
     <ClInclude Include="..\Include\opcode.h" />
     <ClInclude Include="..\Include\osdefs.h" />
+    <ClInclude Include="..\Include\osmodule.h" />
     <ClInclude Include="..\Include\parsetok.h" />
     <ClInclude Include="..\Include\patchlevel.h" />
     <ClInclude Include="..\Include\pgen.h" />
@@ -417,4 +418,4 @@
   <Target Name="_WarnAboutToolset" BeforeTargets="PrepareForBuild" Condition="$(PlatformToolset) != 'v140'">
     <Warning Text="Toolset $(PlatformToolset) is not used for official builds. Your build may have errors or incompatibilities." />
   </Target>
-</Project>
\ No newline at end of file
+</Project>
diff --git a/PCbuild/pythoncore.vcxproj.filters b/PCbuild/pythoncore.vcxproj.filters
index 03cace458fd..ce2ea60a58f 100644
--- a/PCbuild/pythoncore.vcxproj.filters
+++ b/PCbuild/pythoncore.vcxproj.filters
@@ -177,6 +177,9 @@
     <ClInclude Include="..\Include\osdefs.h">
       <Filter>Include</Filter>
     </ClInclude>
+    <ClInclude Include="..\Include\osmodule.h">
+      <Filter>Include</Filter>
+    </ClInclude>
     <ClInclude Include="..\Include\parsetok.h">
       <Filter>Include</Filter>
     </ClInclude>
@@ -983,4 +986,4 @@
       <Filter>Resource Files</Filter>
     </ResourceCompile>
   </ItemGroup>
-</Project>
\ No newline at end of file
+</Project>