diff --git a/Android.mk b/Android.mk
index 58b0607..9c16b1f 100644
--- a/Android.mk
+++ b/Android.mk
@@ -228,6 +228,12 @@
 ifeq ($(TW_USE_MODEL_HARDWARE_ID_FOR_DEVICE_ID), true)
     LOCAL_CFLAGS += -DTW_USE_MODEL_HARDWARE_ID_FOR_DEVICE_ID
 endif
+ifneq ($(TW_BRIGHTNESS_PATH),)
+	LOCAL_CFLAGS += -DTW_BRIGHTNESS_PATH=$(TW_BRIGHTNESS_PATH)
+endif
+ifneq ($(TW_MAX_BRIGHTNESS),)
+	LOCAL_CFLAGS += -DTW_MAX_BRIGHTNESS=$(TW_MAX_BRIGHTNESS)
+endif
 ifeq ($(TARGET_BOARD_PLATFORM),rk30xx)
     LOCAL_CFLAGS += -DRK3066
 endif