diff --git a/tests/cpp11_condition_variable/Makefile b/tests/cpp11_condition_variable/Makefile
index 4414051886..cf2c81d3a9 100644
--- a/tests/cpp11_condition_variable/Makefile
+++ b/tests/cpp11_condition_variable/Makefile
@@ -1,9 +1,5 @@
 include ../Makefile.tests_common
 
-# If you want to add some extra flags when compile c++ files, add these flags
-# 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 (,$(filter nucleo-f303k8 nucleo-f334r8,$(BOARD)))
diff --git a/tests/cpp11_mutex/Makefile b/tests/cpp11_mutex/Makefile
index 4038dfcec4..6ec1d9fd36 100644
--- a/tests/cpp11_mutex/Makefile
+++ b/tests/cpp11_mutex/Makefile
@@ -1,9 +1,5 @@
 include ../Makefile.tests_common
 
-# If you want to add some extra flags when compile c++ files, add these flags
-# to CXXEXFLAGS variable
-CXXEXFLAGS += -std=c++11
-
 USEMODULE += cpp11-compat
 USEMODULE += xtimer
 
diff --git a/tests/cpp11_thread/Makefile b/tests/cpp11_thread/Makefile
index 8c443eb721..81920c7871 100644
--- a/tests/cpp11_thread/Makefile
+++ b/tests/cpp11_thread/Makefile
@@ -1,9 +1,5 @@
 include ../Makefile.tests_common
 
-# If you want to add some extra flags when compile c++ files, add these flags
-# to CXXEXFLAGS variable
-CXXEXFLAGS += -std=c++11
-
 USEMODULE += cpp11-compat
 USEMODULE += xtimer
 USEMODULE += timex