diff --git a/os/hal/ports/WB32/LLD/UARTv1/driver.mk b/os/hal/ports/WB32/LLD/UARTv1/driver.mk
index b82a29b4..9d63e3f2 100644
--- a/os/hal/ports/WB32/LLD/UARTv1/driver.mk
+++ b/os/hal/ports/WB32/LLD/UARTv1/driver.mk
@@ -1,13 +1,13 @@
 ifeq ($(USE_SMART_BUILD),yes)
 ifneq ($(findstring HAL_USE_SERIAL TRUE,$(HALCONF)),)
-PLATFORMSRC += $(CHIBIOS_CONTRIB)/os/hal/ports/WB32/LLD/UARTv1/hal_serial_lld.c
+PLATFORMSRC_CONTRIB += $(CHIBIOS_CONTRIB)/os/hal/ports/WB32/LLD/UARTv1/hal_serial_lld.c
 endif
 ifneq ($(findstring HAL_USE_UART TRUE,$(HALCONF)),)
-PLATFORMSRC += $(CHIBIOS_CONTRIB)/os/hal/ports/WB32/LLD/UARTv1/hal_uart_lld.c
+PLATFORMSRC_CONTRIB += $(CHIBIOS_CONTRIB)/os/hal/ports/WB32/LLD/UARTv1/hal_uart_lld.c
 endif
 else
-PLATFORMSRC += $(CHIBIOS_CONTRIB)/os/hal/ports/WB32/LLD/UARTv1/hal_serial_lld.c
-PLATFORMSRC += $(CHIBIOS_CONTRIB)/os/hal/ports/WB32/LLD/UARTv1/hal_uart_lld.c
+PLATFORMSRC_CONTRIB += $(CHIBIOS_CONTRIB)/os/hal/ports/WB32/LLD/UARTv1/hal_serial_lld.c
+PLATFORMSRC_CONTRIB += $(CHIBIOS_CONTRIB)/os/hal/ports/WB32/LLD/UARTv1/hal_uart_lld.c
 endif
 
 PLATFORMINC_CONTRIB += $(CHIBIOS_CONTRIB)/os/hal/ports/WB32/LLD/UARTv1