diff --git a/Include/sysmodule.h b/Include/sysmodule.h
index eeb8619..2268f3a 100644
--- a/Include/sysmodule.h
+++ b/Include/sysmodule.h
@@ -10,6 +10,7 @@
 PyAPI_FUNC(PyObject *) PySys_GetObject(const char *);
 PyAPI_FUNC(int) PySys_SetObject(const char *, PyObject *);
 PyAPI_FUNC(void) PySys_SetArgv(int, wchar_t **);
+PyAPI_FUNC(void) PySys_SetArgvEx(int, wchar_t **, int);
 PyAPI_FUNC(void) PySys_SetPath(const wchar_t *);
 
 PyAPI_FUNC(void) PySys_WriteStdout(const char *format, ...)