diff --git a/src/arch/amd64.ins b/src/arch/amd64.ins
index fec35f2..37beeef 100644
--- a/src/arch/amd64.ins
+++ b/src/arch/amd64.ins
@@ -20,4 +20,4 @@
 /* MOV		0x4989		2					*/
 { "mov",	0x4989,		OP2F, AOT_NONE,   AOT_NONE,   AOT_NONE	},
 /* SUB		0x4883		2					*/
-{ "sub",	0x4883,		OP2F, AOT_NONE,   AOT_NONE,   AOT_NONE	},
+{ "sub",	0x4883,		OP2F, OP_U8,      OP_U8,      AOT_NONE	},