diff --git a/dynasm/dasm_s390x.lua b/dynasm/dasm_s390x.lua
index 602428b8..cfe861cb 100644
--- a/dynasm/dasm_s390x.lua
+++ b/dynasm/dasm_s390x.lua
@@ -462,6 +462,7 @@ map_op = {
   axbr_2 =	"0000b34a0000h",
   adbr_2 =	"0000b31a0000h",
   aebr_2 =	"0000b30a0000h",
+  aghi_2 =	"0000a70b0000i",
   ah_2 =	"00004a000000j",
   ahi_2 =	"0000a70a0000i",
   ahy_2 =	"e3000000007al",