diff --git a/keyboards/yowkees/keyball39/rules.mk b/keyboards/yowkees/keyball39/rules.mk
index ab5a7fab188..bab3a7702d7 100644
--- a/keyboards/yowkees/keyball39/rules.mk
+++ b/keyboards/yowkees/keyball39/rules.mk
@@ -1,7 +1,7 @@
 # Optical sensor driver for trackball.
 POINTING_DEVICE_DRIVER = custom
 SRC += drivers/pmw3360/pmw3360.c
-QUANTUM_LIB_SRC += spi_master.c # Optical sensor use SPI to communicate
+SPI_DRIVER_REQUIRED = yes
 
 SRC += lib/oledkit/oledkit.c    # OLED utility for Keyball series.