diff --git a/qemu/qom/cpu.c b/qemu/qom/cpu.c
index b79fd8a0..307b9254 100644
--- a/qemu/qom/cpu.c
+++ b/qemu/qom/cpu.c
@@ -145,7 +145,7 @@ static void cpu_common_reset(CPUState *cpu)
     cpu->mem_io_pc = 0;
     cpu->mem_io_vaddr = 0;
     cpu->icount_extra = 0;
-    cpu->icount_decr.u32 = 0;
+    atomic_set(&cpu->icount_decr.u32, 0);
     cpu->can_do_io = 0;
     cpu->exception_index = -1;
     cpu->crash_occurred = false;