diff --git a/boards/nucleo-f334/Makefile.include b/boards/nucleo-f334/Makefile.include
index b2b5ef4abe..089b30718a 100644
--- a/boards/nucleo-f334/Makefile.include
+++ b/boards/nucleo-f334/Makefile.include
@@ -34,7 +34,7 @@ export CXXUWFLAGS +=
 export CXXEXFLAGS +=
 
 # define build specific options
-export CPU_USAGE = -mcpu=cortex-m3
+export CPU_USAGE = -mcpu=cortex-m4
 export FPU_USAGE =
 export CFLAGS += -ggdb -g3 -std=gnu99 -Os -Wall -Wstrict-prototypes $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian -mthumb -mthumb-interwork -nostartfiles
 export CFLAGS += -ffunction-sections -fdata-sections -fno-builtin
diff --git a/tests/pthread_rwlock/Makefile b/tests/pthread_rwlock/Makefile
index 563015c43b..15267df22f 100644
--- a/tests/pthread_rwlock/Makefile
+++ b/tests/pthread_rwlock/Makefile
@@ -13,6 +13,6 @@ DISABLE_MODULE += auto_init
 CFLAGS += -DNATIVE_AUTO_EXIT
 
 BOARD_INSUFFICIENT_RAM += chronos mbed_lpc1768 msb-430 msb-430h stm32f0discovery \
-                          pca10000 pca10005 yunjia-nrf51822 spark-core
+                          pca10000 pca10005 yunjia-nrf51822 spark-core nucleo-f334
 
 include $(RIOTBASE)/Makefile.include
diff --git a/tests/thread_cooperation/Makefile b/tests/thread_cooperation/Makefile
index 7b41cc0a6f..8b88072e97 100644
--- a/tests/thread_cooperation/Makefile
+++ b/tests/thread_cooperation/Makefile
@@ -2,7 +2,7 @@ APPLICATION = thread_cooperation
 include ../Makefile.tests_common
 
 BOARD_INSUFFICIENT_RAM := chronos msb-430 msb-430h mbed_lpc1768 redbee-econotag stm32f0discovery \
-                          pca10000 pca10005 yunjia-nrf51822 spark-core airfy-beacon
+                          pca10000 pca10005 yunjia-nrf51822 spark-core airfy-beacon nucleo-f334
 
 DISABLE_MODULE += auto_init
 
diff --git a/tests/unittests/Makefile b/tests/unittests/Makefile
index de88613e60..c3e63887d4 100644
--- a/tests/unittests/Makefile
+++ b/tests/unittests/Makefile
@@ -2,7 +2,7 @@ APPLICATION = unittests
 include ../Makefile.tests_common
 
 BOARD_INSUFFICIENT_RAM := chronos msb-430 msb-430h redbee-econotag stm32f0discovery \
-                          telosb wsn430-v1_3b wsn430-v1_4 z1
+                          telosb wsn430-v1_3b wsn430-v1_4 z1 nucleo-f334
 
 USEMODULE += embunit