diff --git a/qemu/target/mips/translate.c b/qemu/target/mips/translate.c
index 9fa08d82..75a2b16c 100644
--- a/qemu/target/mips/translate.c
+++ b/qemu/target/mips/translate.c
@@ -23704,7 +23704,7 @@ static void decode_opc_special_legacy(CPUMIPSState *env, DisasContext *ctx)
     case OPC_MOVN:         /* Conditional move */
     case OPC_MOVZ:
         check_insn(ctx, ISA_MIPS4 | ISA_MIPS32 |
-                   INSN_LOONGSON2E | INSN_LOONGSON2F);
+                   INSN_LOONGSON2E | INSN_LOONGSON2F | INSN_R5900);
         gen_cond_move(ctx, op1, rd, rs, rt);
         break;
     case OPC_MFHI:          /* Move from HI/LO */
@@ -26570,7 +26570,8 @@ static void decode_opc(CPUMIPSState *env, DisasContext *ctx, bool *insn_need_pat
         break;
     case OPC_PREF:
         check_insn_opc_removed(ctx, ISA_MIPS32R6);
-        check_insn(ctx, ISA_MIPS4 | ISA_MIPS32);
+        check_insn(ctx, ISA_MIPS4 | ISA_MIPS32 |
+                   INSN_R5900);
         /* Treat as NOP. */
         break;