diff --git a/Makefile.pre.in b/Makefile.pre.in
index cd66c475665..c1b512b9476 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -1697,6 +1697,7 @@ PYTHON_HEADERS= \
 		$(srcdir)/Include/cpython/object.h \
 		$(srcdir)/Include/cpython/objimpl.h \
 		$(srcdir)/Include/cpython/odictobject.h \
+		$(srcdir)/Include/cpython/optimizer.h \
 		$(srcdir)/Include/cpython/picklebufobject.h \
 		$(srcdir)/Include/cpython/pthread_stubs.h \
 		$(srcdir)/Include/cpython/pyctype.h \
diff --git a/PCbuild/pythoncore.vcxproj b/PCbuild/pythoncore.vcxproj
index 4ccd2b5edd3..c99bc905c89 100644
--- a/PCbuild/pythoncore.vcxproj
+++ b/PCbuild/pythoncore.vcxproj
@@ -162,6 +162,7 @@
     <ClInclude Include="..\Include\cpython\object.h" />
     <ClInclude Include="..\Include\cpython\objimpl.h" />
     <ClInclude Include="..\Include\cpython\odictobject.h" />
+    <ClInclude Include="..\Include\cpython\optimizer.h" />
     <ClInclude Include="..\Include\cpython\parser_interface.h" />
     <ClInclude Include="..\Include\cpython\picklebufobject.h" />
     <ClInclude Include="..\Include\cpython\pyarena.h" />
diff --git a/PCbuild/pythoncore.vcxproj.filters b/PCbuild/pythoncore.vcxproj.filters
index 99f924856a3..53e89457f72 100644
--- a/PCbuild/pythoncore.vcxproj.filters
+++ b/PCbuild/pythoncore.vcxproj.filters
@@ -393,6 +393,9 @@
     <ClInclude Include="..\Include\cpython\odictobject.h">
       <Filter>Include</Filter>
     </ClInclude>
+    <ClInclude Include="..\Include\cpython\optimizer.h">
+      <Filter>Include</Filter>
+    </ClInclude>
     <ClInclude Include="..\Include\cpython\unicodeobject.h">
       <Filter>Include\cpython</Filter>
     </ClInclude>