diff --git a/boards/arduino-leonardo/Makefile.include b/boards/arduino-leonardo/Makefile.include
index 263d22ec8a..a6a7149edc 100644
--- a/boards/arduino-leonardo/Makefile.include
+++ b/boards/arduino-leonardo/Makefile.include
@@ -1,9 +1,3 @@
-# For backward compatibility
-ifneq (,$(AVRDUDE_PORT))
-  $(warning Warning! AVRDUDE_PORT is deprecated use PROG_DEV)
-  PROG_DEV ?= $(AVRDUDE_PORT)
-endif
-
 PORT_LINUX      ?= /dev/ttyUSB0
 PROG_DEV        ?= /dev/ttyACM0
 PORT_DARWIN     ?= $(firstword $(sort $(wildcard /dev/tty.usbmodem*)))
diff --git a/boards/mega-xplained/Makefile.include b/boards/mega-xplained/Makefile.include
index e687e75691..954bfab53e 100644
--- a/boards/mega-xplained/Makefile.include
+++ b/boards/mega-xplained/Makefile.include
@@ -2,12 +2,6 @@
 # https://www.microchip.com/DevelopmentTools/ProductDetails/atmega1284p-xpld
 ATMEGA_BOOTLOADER_SIZE ?= 4K
 
-# For backward compatibility
-ifneq (,$(AVRDUDE_PORT))
-  $(warning Warning! AVRDUDE_PORT is deprecated use PROG_DEV)
-  PROG_DEV ?= $(AVRDUDE_PORT)
-endif
-
 # Avrdude programmer defaults to the external flasher Bus Pirate ISP.
 AVRDUDE_PROGRAMMER  ?= buspirate
 # set serial port for avrdude with buspirate