diff --git a/mach/i86/as/mach3.c b/mach/i86/as/mach3.c
index 58c633a9d..46f0f4855 100644
--- a/mach/i86/as/mach3.c
+++ b/mach/i86/as/mach3.c
@@ -33,7 +33,7 @@
 0,	PREFIX,		066,		"sseg",
 0,	PREFIX,		076,		"dseg",
 0,	PREFIX,		0360,		"lock",
-0,	PREFIX,		0362,		"rep",
+0,	PREFIX,		0363,		"rep",
 0,	PREFIX,		0362,		"repne",
 0,	PREFIX,		0362,		"repnz",
 0,	PREFIX,		0363,		"repe",