diff --git a/Makefile.pre.in b/Makefile.pre.in
index 05c195767a8ba0..cd7098cac72b1d 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -1056,6 +1056,7 @@ PYTHON_HEADERS= \
 		$(srcdir)/Include/cpython/objimpl.h \
 		$(srcdir)/Include/cpython/pyerrors.h \
 		$(srcdir)/Include/cpython/pylifecycle.h \
+		$(srcdir)/Include/cpython/pymem.h \
 		$(srcdir)/Include/cpython/pystate.h \
 		$(srcdir)/Include/cpython/tupleobject.h \
 		$(srcdir)/Include/cpython/unicodeobject.h \
diff --git a/PCbuild/pythoncore.vcxproj b/PCbuild/pythoncore.vcxproj
index a980799461a306..a135e9326c781e 100644
--- a/PCbuild/pythoncore.vcxproj
+++ b/PCbuild/pythoncore.vcxproj
@@ -117,6 +117,7 @@
     <ClInclude Include="..\Include\cpython\objimpl.h" />
     <ClInclude Include="..\Include\cpython\pyerrors.h" />
     <ClInclude Include="..\Include\cpython\pylifecycle.h" />
+    <ClInclude Include="..\Include\cpython\pymem.h" />
     <ClInclude Include="..\Include\cpython\pystate.h" />
     <ClInclude Include="..\Include\cpython\tupleobject.h" />
     <ClInclude Include="..\Include\cpython\unicodeobject.h" />
diff --git a/PCbuild/pythoncore.vcxproj.filters b/PCbuild/pythoncore.vcxproj.filters
index f92433e3e0c97e..9134646567954e 100644
--- a/PCbuild/pythoncore.vcxproj.filters
+++ b/PCbuild/pythoncore.vcxproj.filters
@@ -102,6 +102,9 @@
     <ClInclude Include="..\Include\cpython\pylifecycle.h">
       <Filter>Include</Filter>
     </ClInclude>
+    <ClInclude Include="..\Include\cpython\pymem.h">
+      <Filter>Include</Filter>
+    </ClInclude>
     <ClInclude Include="..\Include\cpython\pystate.h">
       <Filter>Include</Filter>
     </ClInclude>