diff --git a/config.mk b/config.mk
index 0e0b15e..21a6000 100644
--- a/config.mk
+++ b/config.mk
@@ -1,4 +1,3 @@
-ARTERY_CONTRIB = $(BOARD_DIR)/OS
 
 USE_LIS302 = no
 USE_FATFS = no
diff --git a/hw_layer_at/hw_ports.mk b/hw_layer_at/hw_ports.mk
index fe45faf..a2ab433 100644
--- a/hw_layer_at/hw_ports.mk
+++ b/hw_layer_at/hw_ports.mk
@@ -1,4 +1,4 @@
 MCU = cortex-m4
 
-HW_LAYER_EMS_CPP += $(ARTERY_CONTRIB)/../mpu_util.cpp
+HW_LAYER_EMS_CPP += $(BOARD_DIR)/mpu_util.cpp