diff --git a/ports/atmel-samd/boards/neopixel_trinkey_m0/mpconfigboard.h b/ports/atmel-samd/boards/neopixel_trinkey_m0/mpconfigboard.h
index 7a923ead11..1eb6fbf3e6 100644
--- a/ports/atmel-samd/boards/neopixel_trinkey_m0/mpconfigboard.h
+++ b/ports/atmel-samd/boards/neopixel_trinkey_m0/mpconfigboard.h
@@ -2,6 +2,7 @@
 #define MICROPY_HW_MCU_NAME "samd21e18"
 
 #define MICROPY_HW_NEOPIXEL (&pin_PA05)
+#define MICROPY_HW_NEOPIXEL_COUNT (4)
 
 #define IGNORE_PIN_PA00     1
 #define IGNORE_PIN_PA01     1
diff --git a/ports/esp32s2/boards/adafruit_magtag_2.9_grayscale/mpconfigboard.h b/ports/esp32s2/boards/adafruit_magtag_2.9_grayscale/mpconfigboard.h
index d0d1864993..343bb525f1 100644
--- a/ports/esp32s2/boards/adafruit_magtag_2.9_grayscale/mpconfigboard.h
+++ b/ports/esp32s2/boards/adafruit_magtag_2.9_grayscale/mpconfigboard.h
@@ -32,6 +32,7 @@
 #define MICROPY_HW_NEOPIXEL (&pin_GPIO1)
 #define CIRCUITPY_STATUS_LED_POWER (&pin_GPIO21)
 #define CIRCUITPY_STATUS_LED_POWER_INVERTED (1)
+#define MICROPY_HW_NEOPIXEL_COUNT (4)
 
 #define CIRCUITPY_BOOT_BUTTON (&pin_GPIO0)