diff --git a/tests/unittests/Makefile b/tests/unittests/Makefile
index bb66096f82..72e1b42aee 100644
--- a/tests/unittests/Makefile
+++ b/tests/unittests/Makefile
@@ -1,6 +1,24 @@
 DEVELHELP ?= 0
 include ../Makefile.tests_common
 
+# Issue with integer width
+# There are present for a long time but hidden by being not compiled
+BOARD_BLACKLIST += arduino-duemilanove
+BOARD_BLACKLIST += arduino-leonardo
+BOARD_BLACKLIST += arduino-mega2560
+BOARD_BLACKLIST += arduino-nano
+BOARD_BLACKLIST += arduino-uno
+BOARD_BLACKLIST += chronos
+BOARD_BLACKLIST += jiminy-mega256rfr2
+BOARD_BLACKLIST += mega-xplained
+BOARD_BLACKLIST += msb-430
+BOARD_BLACKLIST += msb-430h
+BOARD_BLACKLIST += telosb
+BOARD_BLACKLIST += waspmote-pro
+BOARD_BLACKLIST += wsn430-v1_3b
+BOARD_BLACKLIST += wsn430-v1_4
+BOARD_BLACKLIST += z1
+
 BOARD_INSUFFICIENT_MEMORY := airfy-beacon \
                              arduino-duemilanove \
                              arduino-leonardo \