diff --git a/src/soc/mediatek/mt8188/Makefile.inc b/src/soc/mediatek/mt8188/Makefile.inc
index 2bef2e2596..81bdfb57ca 100644
--- a/src/soc/mediatek/mt8188/Makefile.inc
+++ b/src/soc/mediatek/mt8188/Makefile.inc
@@ -1,7 +1,7 @@
 ifeq ($(CONFIG_SOC_MEDIATEK_MT8188),y)
 
 all-$(CONFIG_SPI_FLASH) += spi.c
-all-y += ../common/timer.c
+all-y += ../common/timer.c ../common/timer_prepare.c
 all-y += ../common/uart.c
 
 bootblock-y += bootblock.c