diff --git a/boards/arduino-due/Makefile.include b/boards/arduino-due/Makefile.include
index 4853a4151995622364c6e8351ff8f88696ac2d20..328f58611a34ec31d7054d2be37f4c3ffec5cc56 100644
--- a/boards/arduino-due/Makefile.include
+++ b/boards/arduino-due/Makefile.include
@@ -1,6 +1,5 @@
 # define the cpu used by the arduino due board
 export CPU = sam3x8e
-export CPU_MODEL = sam3x8e
 
 # define the default port depending on the host OS
 PORT_LINUX ?= /dev/ttyACM0
diff --git a/boards/mbed_lpc1768/Makefile.include b/boards/mbed_lpc1768/Makefile.include
index d793033390df1e137990df437ca416e3bb39bdfe..8dd9ed1e9b7aa040447415917917f1e4bc8bb428 100644
--- a/boards/mbed_lpc1768/Makefile.include
+++ b/boards/mbed_lpc1768/Makefile.include
@@ -1,7 +1,5 @@
 # define the cpu used by the mbed_lpx1768 board
 export CPU = lpc1768
-export CPU_MODEL = lpc1768
-
 
 export FLASHER = $(RIOTBOARD)/$(BOARD)/dist/flash.sh
 export DEBUGGER =
diff --git a/boards/udoo/Makefile.include b/boards/udoo/Makefile.include
index 2f3f84c1f8407ad039adf60f399a7a1570e68a37..71d88e604468f6a0e8d8585f0ef20eeafacd6a59 100644
--- a/boards/udoo/Makefile.include
+++ b/boards/udoo/Makefile.include
@@ -1,6 +1,5 @@
 # define the cpu used by the udoo board
 export CPU = sam3x8e
-export CPU_MODEL = sam3x8e
 
 #define the flash-tool and default port depending on the host operating system
 OS := $(shell uname)