diff --git a/mach/i86/libsys/gtty.s b/mach/i86/libsys/gtty.s
index 4e8b0e6c2..58569489a 100644
--- a/mach/i86/libsys/gtty.s
+++ b/mach/i86/libsys/gtty.s
@@ -5,7 +5,7 @@ _gtty:
 	push	bp
 	mov	bp,sp
 push 6(bp)
-mov ax,29704
+mov ax,0x5401
 push ax
 push 4(bp)
 call _ioctl
diff --git a/mach/i86/libsys/stty.s b/mach/i86/libsys/stty.s
index 701bb18a3..01efaba6f 100644
--- a/mach/i86/libsys/stty.s
+++ b/mach/i86/libsys/stty.s
@@ -5,7 +5,7 @@ _stty:
 	push	bp
 	mov	bp,sp
 push 6(bp)
-mov ax,29705
+mov ax,0x5402
 push ax
 push 4(bp)
 call _ioctl