diff --git a/mach/i386/as/mach3.c b/mach/i386/as/mach3.c
index bdc9226d..b4066886 100644
--- a/mach/i386/as/mach3.c
+++ b/mach/i386/as/mach3.c
@@ -176,9 +176,9 @@
 0,	NOOP_1,		0244,		"movsb",
 0,	NOOP_1,		0245,		"movs",
 0,	NOOP_1,		0246,		"cmpsb",
-0,	NOOP_1,		0246,		"insb",
+0,	NOOP_1,		0154,		"insb",
 0,	NOOP_1,		0247,		"cmps",
-0,	NOOP_1,		0247,		"ins",
+0,	NOOP_1,		0155,		"ins",
 0,	NOOP_1,		0252,		"stosb",
 0,	NOOP_1,		0253,		"stos",
 0,	NOOP_1,		0254,		"lodsb",