diff --git a/Include/Python-ast.h b/Include/Python-ast.h
index 1b7d9b10b1a..1a2b8297810 100644
--- a/Include/Python-ast.h
+++ b/Include/Python-ast.h
@@ -8,7 +8,7 @@ extern "C" {
 
 #include "asdl.h"
 
-#undef Yield /* undefine macro conflicting with winbase.h */
+#undef Yield   /* undefine macro conflicting with <winbase.h> */
 
 typedef struct _mod *mod_ty;
 
diff --git a/Modules/parsermodule.c b/Modules/parsermodule.c
index df239d67b2f..c8fb3d21771 100644
--- a/Modules/parsermodule.c
+++ b/Modules/parsermodule.c
@@ -32,6 +32,7 @@
 
 #include "Python.h"                     /* general Python API             */
 #include "Python-ast.h"                 /* mod_ty */
+#undef Yield   /* undefine macro conflicting with <winbase.h> */
 #include "ast.h"
 #include "graminit.h"                   /* symbols defined in the grammar */
 #include "node.h"                       /* internal parser structure      */
diff --git a/Parser/asdl_c.py b/Parser/asdl_c.py
index 6a8262c73b3..75fb78b9c94 100644
--- a/Parser/asdl_c.py
+++ b/Parser/asdl_c.py
@@ -1247,7 +1247,7 @@ def main(srcfile, dump_module=False):
             f.write('\n')
             f.write('#include "asdl.h"\n')
             f.write('\n')
-            f.write('#undef Yield /* undefine macro conflicting with winbase.h */\n')
+            f.write('#undef Yield   /* undefine macro conflicting with <winbase.h> */\n')
             f.write('\n')
             c = ChainOfVisitors(TypeDefVisitor(f),
                                 StructVisitor(f),
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 14550fd233f..f0d342ae92d 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -3,6 +3,7 @@
 #include "Python.h"
 #include <ctype.h>
 #include "ast.h"
+#undef Yield   /* undefine macro conflicting with <winbase.h> */
 #include "pycore_pystate.h"
 
 _Py_IDENTIFIER(__builtins__);
diff --git a/Python/import.c b/Python/import.c
index f7c37aa353c..15637c6a1f3 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -3,6 +3,7 @@
 #include "Python.h"
 
 #include "Python-ast.h"
+#undef Yield   /* undefine macro conflicting with <winbase.h> */
 #include "pycore_pyhash.h"
 #include "pycore_pylifecycle.h"
 #include "pycore_pymem.h"
diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index 58e16473100..af3d5ef055f 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -3,6 +3,7 @@
 #include "Python.h"
 
 #include "Python-ast.h"
+#undef Yield   /* undefine macro conflicting with <winbase.h> */
 #include "pycore_context.h"
 #include "pycore_hamt.h"
 #include "pycore_pathconfig.h"
diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 1bf822ceadb..2d5dc88c5c7 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -11,6 +11,7 @@
 #include "Python.h"
 
 #include "Python-ast.h"
+#undef Yield   /* undefine macro conflicting with <winbase.h> */
 #include "pycore_pystate.h"
 #include "grammar.h"
 #include "node.h"
diff --git a/Python/symtable.c b/Python/symtable.c
index 96f7bcda5e2..677b6043438 100644
--- a/Python/symtable.c
+++ b/Python/symtable.c
@@ -1,6 +1,7 @@
 #include "Python.h"
 #include "pycore_pystate.h"
 #include "symtable.h"
+#undef Yield   /* undefine macro conflicting with <winbase.h> */
 #include "structmember.h"
 
 /* error strings used for warnings */