diff --git a/src/cmd/9term/AIX.c b/src/cmd/9term/AIX.c
index b7ccbf0f..eec79c28 100644
--- a/src/cmd/9term/AIX.c
+++ b/src/cmd/9term/AIX.c
@@ -1,2 +1 @@
-#define TIOCSCTTY	0x540E
 #include "bsdpty.c"
diff --git a/src/cmd/9term/bsdpty.c b/src/cmd/9term/bsdpty.c
index 3710a18d..e7e047e3 100644
--- a/src/cmd/9term/bsdpty.c
+++ b/src/cmd/9term/bsdpty.c
@@ -63,8 +63,10 @@ childpty(int fd[], char *slave)
 	sfd = open(slave, ORDWR);
 	if(sfd < 0)
 		sysfatal("child open %s: %r\n", slave);
+#if !defined (__AIX__)
 	if(ioctl(sfd, TIOCSCTTY, 0) < 0)
 		fprint(2, "ioctl TIOCSCTTY: %r\n");
+#endif
 	return sfd;
 }