diff --git a/cpu/atmega_common/include/cpu_conf.h b/cpu/atmega_common/include/cpu_conf.h
index d20bea4eb2..43d43afcd4 100644
--- a/cpu/atmega_common/include/cpu_conf.h
+++ b/cpu/atmega_common/include/cpu_conf.h
@@ -49,7 +49,7 @@ extern "C" {
  * to avoid not printing of debug in interrupts
  */
 #ifndef THREAD_STACKSIZE_IDLE
-#ifdef MODULE_XTIMER
+#if MODULE_XTIMER || MODULE_ZTIMER64
 /* xtimer's 64 bit arithmetic doesn't perform well on 8 bit archs. In order to
  * prevent a stack overflow when an timer triggers while the idle thread is
  * running, we have to increase the stack size then