diff --git a/src/target/mips32.h b/src/target/mips32.h
index 7a4dd5e68..6f73d321d 100644
--- a/src/target/mips32.h
+++ b/src/target/mips32.h
@@ -112,8 +112,8 @@ typedef struct mips32_core_reg_s
 #define MIPS32_LW(reg, off, base)	MIPS32_I_INST(MIPS32_OP_LW, base, reg, off)
 #define MIPS32_MFLO(reg)			MIPS32_R_INST(0, 0, 0, reg, 0, MIPS32_OP_MFLO)
 #define MIPS32_MFHI(reg)			MIPS32_R_INST(0, 0, 0, reg, 0, MIPS32_OP_MFHI)
-#define MIPS32_MTLO(reg)			MIPS32_R_INST(0, 0, 0, reg, 0, MIPS32_OP_MTLO)
-#define MIPS32_MTHI(reg)			MIPS32_R_INST(0, 0, 0, reg, 0, MIPS32_OP_MTHI)
+#define MIPS32_MTLO(reg)			MIPS32_R_INST(0, reg, 0, 0, 0, MIPS32_OP_MTLO)
+#define MIPS32_MTHI(reg)			MIPS32_R_INST(0, reg, 0, 0, 0, MIPS32_OP_MTHI)
 #define MIPS32_ORI(src, tar, val)	MIPS32_I_INST(MIPS32_OP_ORI, src, tar, val)
 #define MIPS32_SB(reg, off, base)	MIPS32_I_INST(MIPS32_OP_SB, base, reg, off)
 #define MIPS32_SH(reg, off, base)	MIPS32_I_INST(MIPS32_OP_SH, base, reg, off)