diff --git a/ports/esp32/boards/sdkconfig b/ports/esp32/boards/sdkconfig
index f68102bee0..0453cccbf5 100644
--- a/ports/esp32/boards/sdkconfig
+++ b/ports/esp32/boards/sdkconfig
@@ -13,6 +13,7 @@ CONFIG_LOG_BOOTLOADER_LEVEL_WARN=y
 # ESP32-specific
 CONFIG_ESP32_DEFAULT_CPU_FREQ_240=y
 CONFIG_TASK_WDT_CHECK_IDLE_TASK_CPU0=n
+CONFIG_ESP32_XTAL_FREQ_AUTO=y
 
 # FreeRTOS
 CONFIG_FREERTOS_UNICORE=y
diff --git a/ports/esp32/boards/sdkconfig.spiram b/ports/esp32/boards/sdkconfig.spiram
index 63908f4b05..4154b5e42e 100644
--- a/ports/esp32/boards/sdkconfig.spiram
+++ b/ports/esp32/boards/sdkconfig.spiram
@@ -14,6 +14,7 @@ CONFIG_LOG_BOOTLOADER_LEVEL_WARN=y
 CONFIG_ESP32_DEFAULT_CPU_FREQ_240=y
 CONFIG_SPIRAM_SUPPORT=y
 CONFIG_TASK_WDT_CHECK_IDLE_TASK_CPU0=n
+CONFIG_ESP32_XTAL_FREQ_AUTO=y
 
 # FreeRTOS
 CONFIG_FREERTOS_UNICORE=y