diff --git a/Include/sysmodule.h b/Include/sysmodule.h
index 536a180..16af119 100644
--- a/Include/sysmodule.h
+++ b/Include/sysmodule.h
@@ -11,6 +11,7 @@
 PyAPI_FUNC(int) PySys_SetObject(char *, PyObject *);
 PyAPI_FUNC(FILE *) PySys_GetFile(char *, FILE *);
 PyAPI_FUNC(void) PySys_SetArgv(int, char **);
+PyAPI_FUNC(void) PySys_SetArgvEx(int, char **, int);
 PyAPI_FUNC(void) PySys_SetPath(char *);
 
 PyAPI_FUNC(void) PySys_WriteStdout(const char *format, ...)