diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c
index c3f3e4d..020faf0 100644
--- a/tcg/i386/tcg-target.c
+++ b/tcg/i386/tcg-target.c
@@ -184,6 +184,9 @@ static inline int tcg_target_const_match(tcg_target_long val,
 #define OPC_MOVZWL	(0xb7 | P_EXT)
 #define OPC_MOVSBL	(0xbe | P_EXT)
 #define OPC_MOVSWL	(0xbf | P_EXT)
+#define OPC_IMUL_GvEv	(0xaf | P_EXT)
+#define OPC_IMUL_GvEvIb	(0x6b)
+#define OPC_IMUL_GvEvIz	(0x69)
 #define OPC_POP_r32	(0x58)
 #define OPC_PUSH_r32	(0x50)
 #define OPC_PUSH_Iv	(0x68)
@@ -1178,14 +1181,14 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
             int32_t val;
             val = args[2];
             if (val == (int8_t)val) {
-                tcg_out_modrm(s, 0x6b, args[0], args[0]);
+                tcg_out_modrm(s, OPC_IMUL_GvEvIb, args[0], args[0]);
                 tcg_out8(s, val);
             } else {
-                tcg_out_modrm(s, 0x69, args[0], args[0]);
+                tcg_out_modrm(s, OPC_IMUL_GvEvIz, args[0], args[0]);
                 tcg_out32(s, val);
             }
         } else {
-            tcg_out_modrm(s, 0xaf | P_EXT, args[0], args[2]);
+            tcg_out_modrm(s, OPC_IMUL_GvEv, args[0], args[2]);
         }
         break;
     case INDEX_op_mulu2_i32: