diff --git a/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.mk b/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.mk
index 60638fd19b..4405b7a354 100644
--- a/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.mk
@@ -23,7 +23,7 @@ CIRCUITPY_SMALL_BUILD = 1
 CHIP_VARIANT = SAMD21E18A
 CHIP_FAMILY = samd21
 
-CFLAGS_INLINE_LIMIT = 35
+CFLAGS_INLINE_LIMIT = 25
 
 # Include these Python libraries in firmware.
 FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_DotStar