diff --git a/tests/cpp11_condition_variable/Makefile b/tests/cpp11_condition_variable/Makefile
index 2d3bd7022d..568b8b8712 100644
--- a/tests/cpp11_condition_variable/Makefile
+++ b/tests/cpp11_condition_variable/Makefile
@@ -13,6 +13,12 @@ BOARD_INSUFFICIENT_MEMORY := i-nucleo-lrwan1 nucleo-f334r8 spark-core \
 # to CXXEXFLAGS variable
 CXXEXFLAGS += -std=c++11
 
+# nucleo-f303k8 doesn't have enough RAM to run the test so we reduce the stack
+# size for every thread
+ifneq (,$(filter nucleo-f303k8,$(BOARD)))
+  CFLAGS += -DTHREAD_STACKSIZE_DEFAULT=512
+endif
+
 USEMODULE += cpp11-compat
 USEMODULE += xtimer
 USEMODULE += timex
diff --git a/tests/pthread_cooperation/Makefile b/tests/pthread_cooperation/Makefile
index 3cd83bd7e1..e57db008d8 100644
--- a/tests/pthread_cooperation/Makefile
+++ b/tests/pthread_cooperation/Makefile
@@ -21,6 +21,12 @@ BOARD_INSUFFICIENT_MEMORY += \
 	waspmote-pro \
 	#
 
+# nucleo-f303k8 doesn't have enough RAM to run the test so we reduce the stack
+# size for every thread
+ifneq (,$(filter nucleo-f303k8,$(BOARD)))
+  CFLAGS += -DTHREAD_STACKSIZE_DEFAULT=512
+endif
+
 USEMODULE += posix_headers
 USEMODULE += pthread
 
diff --git a/tests/thread_cooperation/Makefile b/tests/thread_cooperation/Makefile
index 1706c9de1c..8a29907bc9 100644
--- a/tests/thread_cooperation/Makefile
+++ b/tests/thread_cooperation/Makefile
@@ -2,7 +2,7 @@ include ../Makefile.tests_common
 
 BOARD_INSUFFICIENT_MEMORY := arduino-duemilanove arduino-leonardo arduino-nano \
                              arduino-uno chronos i-nucleo-lrwan1 msb-430 \
-                             msb-430h nucleo-f031k6 nucleo-f303k8 stm32l0538-disco
+                             msb-430h nucleo-f031k6 stm32l0538-disco
 
 DISABLE_MODULE += auto_init
 
@@ -12,6 +12,9 @@ endif
 ifneq (,$(filter nucleo-f030r8 nucleo-l031k6 nucleo-l053r8 stm32f0discovery stm32l0538-disco,$(BOARD)))
   PROBLEM ?= 5
 endif
+ifneq (,$(filter nucleo-f303k8,$(BOARD)))
+  PROBLEM ?= 7
+endif
 ifneq (,$(filter nucleo-f334r8,$(BOARD)))
   PROBLEM ?= 9
 endif