diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index fd0a9c0..814e4ab 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -17,7 +17,9 @@
 #include "Python.h"
 #include "code.h"
 #include "frameobject.h"
-#include "pycore_ceval.h"
+#include "pycore_ceval.h"        // _Py_RecursionLimitLowerWaterMark()
+#include "pycore_pystate.h"      // _PyThreadState_GET()
+#include "pycore_tupleobject.h"
 #include "pycore_initconfig.h"
 #include "pycore_pathconfig.h"
 #include "pycore_pyerrors.h"