diff --git a/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.mk b/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.mk
index b8ae779216..22e59cd773 100644
--- a/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.mk
@@ -15,6 +15,7 @@ LONGINT_IMPL = NONE
 CIRCUITPY_ANALOGIO = 0
 CIRCUITPY_MATH = 0
 CIRCUITPY_NEOPIXEL_WRITE = 0
+CIRCUITPY_PULSEIO = 1
 CIRCUITPY_ROTARYIO = 0
 CIRCUITPY_RTC = 0
 CIRCUITPY_SAMD = 0