diff --git a/cpu/esp32/include/cpu_conf.h b/cpu/esp32/include/cpu_conf.h
index bef2de93c1..58f24ba7f8 100644
--- a/cpu/esp32/include/cpu_conf.h
+++ b/cpu/esp32/include/cpu_conf.h
@@ -38,8 +38,12 @@ extern "C" {
  * @{
  */
 #define THREAD_EXTRA_STACKSIZE_PRINTF (1024)
+#ifndef THREAD_STACKSIZE_DEFAULT
 #define THREAD_STACKSIZE_DEFAULT      (2048)
+#endif
+#ifndef THREAD_STACKSIZE_IDLE
 #define THREAD_STACKSIZE_IDLE         (2048)
+#endif
 /** @} */
 
 /**