diff --git a/target/i386/translate.c b/target/i386/translate.c
index 2e2e0dbddc..70ba0b2d5a 100644
--- a/target/i386/translate.c
+++ b/target/i386/translate.c
@@ -5307,7 +5307,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
             if (!(s->cpuid_ext_features & CPUID_EXT_CX16))
                 goto illegal_op;
             gen_lea_modrm(env, s, modrm);
-            if ((s->prefix & PREFIX_LOCK) && parallel_cpus) {
+            if ((s->prefix & PREFIX_LOCK) && (tb_cflags(s->base.tb) & CF_PARALLEL)) {
                 gen_helper_cmpxchg16b(cpu_env, cpu_A0);
             } else {
                 gen_helper_cmpxchg16b_unlocked(cpu_env, cpu_A0);
@@ -5318,7 +5318,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
             if (!(s->cpuid_features & CPUID_CX8))
                 goto illegal_op;
             gen_lea_modrm(env, s, modrm);
-            if ((s->prefix & PREFIX_LOCK) && parallel_cpus) {
+            if ((s->prefix & PREFIX_LOCK) && (tb_cflags(s->base.tb) & CF_PARALLEL)) {
                 gen_helper_cmpxchg8b(cpu_env, cpu_A0);
             } else {
                 gen_helper_cmpxchg8b_unlocked(cpu_env, cpu_A0);