diff --git a/Arduino.mk b/Arduino.mk
index e4694af..08af529 100644
--- a/Arduino.mk
+++ b/Arduino.mk
@@ -1173,7 +1173,7 @@ endif
 
 # Using += instead of =, so that CPPFLAGS can be set per sketch level
 CPPFLAGS      += -$(MCU_FLAG_NAME)=$(MCU) -DF_CPU=$(F_CPU) -DARDUINO=$(ARDUINO_VERSION) -DARDUINO_$(BOARD) $(ARDUINO_ARCH_FLAG) \
-         "-DARDUINO_BOARD=\"$(BOARD)\"" \
+         "-DARDUINO_BOARD=\"$(BOARD)\"" "-DARDUINO_VARIANT=\"$(VARIANT)\"" \
         -I$(ARDUINO_CORE_PATH) -I$(ARDUINO_CORE_PATH)/api -I$(ARDUINO_VAR_PATH)/$(VARIANT) \
         $(SYS_INCLUDES) $(PLATFORM_INCLUDES) $(USER_INCLUDES) -Wall -ffunction-sections \
         -fdata-sections