diff --git a/ports/espressif/boards/adafruit_feather_esp32s3_4mbflash_2mbpsram/mpconfigboard.mk b/ports/espressif/boards/adafruit_feather_esp32s3_4mbflash_2mbpsram/mpconfigboard.mk
index 39804bad26..1b4c4015f5 100644
--- a/ports/espressif/boards/adafruit_feather_esp32s3_4mbflash_2mbpsram/mpconfigboard.mk
+++ b/ports/espressif/boards/adafruit_feather_esp32s3_4mbflash_2mbpsram/mpconfigboard.mk
@@ -16,4 +16,4 @@ CIRCUITPY_ESP_FLASH_MODE = qio
 CIRCUITPY_ESP_FLASH_FREQ = 40m
 CIRCUITPY_ESP_FLASH_SIZE = 4MB
 
-CIRCUITPY_PS2IO = 0
+OPTIMIZATION_FLAGS = -Os