diff --git a/src/proto/os_unix.pro b/src/proto/os_unix.pro
index cb84994..ee22b4a 100644
--- a/src/proto/os_unix.pro
+++ b/src/proto/os_unix.pro
@@ -5,7 +5,7 @@
 int mch_char_avail(void);
 int mch_check_messages(void);
 long_u mch_total_mem(int special);
-void mch_delay(long msec, int ignoreinput);
+void mch_delay(long msec, int flags);
 int mch_stackcheck(char *p);
 void mch_suspend(void);
 void mch_init(void);