Fix crash at startup with -W options.
diff --git a/Include/pygetopt.h b/Include/pygetopt.h
index 80908be..9860d36 100644
--- a/Include/pygetopt.h
+++ b/Include/pygetopt.h
@@ -9,6 +9,7 @@
 PyAPI_DATA(int) _PyOS_optind;
 PyAPI_DATA(char *) _PyOS_optarg;
 
+PyAPI_FUNC(void) _PyOS_ResetGetOpt(void);
 PyAPI_FUNC(int) _PyOS_GetOpt(int argc, char **argv, char *optstring);
 
 #ifdef __cplusplus