diff --git a/src/os_amiga.c b/src/os_amiga.c
index 58e462d..850c26a 100644
--- a/src/os_amiga.c
+++ b/src/os_amiga.c
@@ -977,7 +977,7 @@
  *	it sends a 0 to the console to make it back into a CON: from a RAW:
  */
     void
-mch_settmode(int tmode)
+mch_settmode(tmode_T tmode)
 {
 #if defined(__AROS__) || defined(__amigaos4__)
     if (!SetMode(raw_in, tmode == TMODE_RAW ? 1 : 0))