diff --git a/Python/import.c b/Python/import.c
index 291e63dc794..b35dea19276 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -4,6 +4,8 @@
 #include "Python.h"
 
 #include "Python-ast.h"
+#undef Yield /* to avoid conflict with winbase.h */
+
 #include "pyarena.h"
 #include "pythonrun.h"
 #include "errcode.h"
diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 75241fe9159..d434d50b4f2 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -4,6 +4,8 @@
 #include "Python.h"
 
 #include "Python-ast.h"
+#undef Yield /* to avoid conflict with winbase.h */
+
 #include "grammar.h"
 #include "node.h"
 #include "token.h"