diff --git a/mach/i386/as/mach3.c b/mach/i386/as/mach3.c
index 37f03566b..d5156ae0c 100644
--- a/mach/i386/as/mach3.c
+++ b/mach/i386/as/mach3.c
@@ -184,10 +184,13 @@
 {0,	NOOP_1,		0155,		"ins"},
 {0,	NOOP_1,		0252,		"stosb"},
 {0,	NOOP_1,		0253,		"stos"},
+{0,	NOOP_1,		0253,		"stosw"},
 {0,	NOOP_1,		0254,		"lodsb"},
 {0,	NOOP_1,		0255,		"lods"},
+{0,	NOOP_1,		0255,		"lodsw"},
 {0,	NOOP_1,		0256,		"scasb"},
 {0,	NOOP_1,		0257,		"scas"},
+{0,	NOOP_1,		0257,		"scasw"},
 {0,	NOOP_1,		0311,		"leave"},
 {0,	NOOP_1,		0316,		"into"},
 {0,	NOOP_1,		0317,		"iret"},