diff --git a/ports/atmel-samd/boards/trinket_m0_haxpress/mpconfigboard.mk b/ports/atmel-samd/boards/trinket_m0_haxpress/mpconfigboard.mk
index e56517b5c7..46f727131d 100644
--- a/ports/atmel-samd/boards/trinket_m0_haxpress/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/trinket_m0_haxpress/mpconfigboard.mk
@@ -13,6 +13,7 @@ LONGINT_IMPL = MPZ
 
 CIRCUITPY_BITBANGIO = 0
 CIRCUITPY_COUNTIO = 0
+CIRCUITPY_RTC = 0
 CIRCUITPY_FREQUENCYIO = 0
 CIRCUITPY_I2CSLAVE = 0