diff --git a/ports/atmel-samd/boards/uchip/mpconfigboard.mk b/ports/atmel-samd/boards/uchip/mpconfigboard.mk
index bd05152a2d..53b8c27713 100644
--- a/ports/atmel-samd/boards/uchip/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/uchip/mpconfigboard.mk
@@ -10,3 +10,5 @@ CIRCUITPY_SMALL_BUILD = 1
 
 CHIP_VARIANT = SAMD21E18A
 CHIP_FAMILY = samd21
+
+CIRCUITPY_FREQUENCYIO = 0