diff --git a/atmel-samd/boards/arduino_zero/mpconfigboard.h b/atmel-samd/boards/arduino_zero/mpconfigboard.h
index 5b1c23d652..fc778a7827 100644
--- a/atmel-samd/boards/arduino_zero/mpconfigboard.h
+++ b/atmel-samd/boards/arduino_zero/mpconfigboard.h
@@ -9,4 +9,4 @@
 
 #define MICROPY_HW_NEOPIXEL PIN_PB22
 
-#define AUTORESET_DELAY_MS 10
+#define AUTORESET_DELAY_MS 500
diff --git a/atmel-samd/boards/feather_m0_adalogger/mpconfigboard.h b/atmel-samd/boards/feather_m0_adalogger/mpconfigboard.h
index f30c02be8f..9c656863b6 100644
--- a/atmel-samd/boards/feather_m0_adalogger/mpconfigboard.h
+++ b/atmel-samd/boards/feather_m0_adalogger/mpconfigboard.h
@@ -6,4 +6,4 @@
 #define MICROPY_HW_BOARD_NAME "Adafruit Feather M0 Adalogger"
 #define MICROPY_HW_MCU_NAME "samd21g18"
 
-#define AUTORESET_DELAY_MS 10
+#define AUTORESET_DELAY_MS 500
diff --git a/atmel-samd/boards/feather_m0_basic/mpconfigboard.h b/atmel-samd/boards/feather_m0_basic/mpconfigboard.h
index 4f884e3641..fa3ffc01a3 100644
--- a/atmel-samd/boards/feather_m0_basic/mpconfigboard.h
+++ b/atmel-samd/boards/feather_m0_basic/mpconfigboard.h
@@ -6,4 +6,4 @@
 #define MICROPY_HW_BOARD_NAME "Adafruit Feather M0 Basic"
 #define MICROPY_HW_MCU_NAME "samd21g18"
 
-#define AUTORESET_DELAY_MS 10
+#define AUTORESET_DELAY_MS 500