diff --git a/ports/atmel-samd/boards/matrixportal_m4/mpconfigboard.mk b/ports/atmel-samd/boards/matrixportal_m4/mpconfigboard.mk
index fdedf9bc9b..3a1d417626 100644
--- a/ports/atmel-samd/boards/matrixportal_m4/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/matrixportal_m4/mpconfigboard.mk
@@ -10,6 +10,8 @@ QSPI_FLASH_FILESYSTEM = 1
 EXTERNAL_FLASH_DEVICES = "S25FL116K, S25FL216K, GD25Q16C"
 LONGINT_IMPL = MPZ
 
+CIRCUITPY_LTO_PARTITION = one
+
 CIRCUITPY_AESIO = 0
 CIRCUITPY_ONEWIREIO = 0
 CIRCUITPY_PARALLELDISPLAY = 0