diff --git a/mach/i386/as/mach3.c b/mach/i386/as/mach3.c
index b4066886b..bf46eb7b2 100644
--- a/mach/i386/as/mach3.c
+++ b/mach/i386/as/mach3.c
@@ -99,7 +99,7 @@
 0,	EXTOP1,		0050,		"verw",
 0,	EXTOP1,		0061,		"lmsw",
 0,	IMUL,		00,		"imul",
-0,	IMULB,		01,		"imulb",
+0,	IMULB,		050,		"imulb",
 0,	INCOP,		000,		"incb",
 0,	INCOP,		001,		"inc",
 0,	INCOP,		010,		"decb",