diff --git a/tests/functional/include/tests/config.h b/tests/functional/include/tests/config.h
index 1416b136a..5c9360d2e 100644
--- a/tests/functional/include/tests/config.h
+++ b/tests/functional/include/tests/config.h
@@ -15,6 +15,7 @@ namespace ut = boost::ut;
 namespace cfg {
 
 using namespace std::literals;
+using namespace leka;
 
 namespace output {
 
diff --git a/tests/functional/include/tests/utils.h b/tests/functional/include/tests/utils.h
index f6f4078ac..c1115d664 100644
--- a/tests/functional/include/tests/utils.h
+++ b/tests/functional/include/tests/utils.h
@@ -11,7 +11,7 @@
 
 #include "LogKit.h"
 
-namespace utils {
+namespace leka::utils {
 
 namespace time {
 
@@ -56,4 +56,4 @@ namespace sd {
 
 }	// namespace sd
 
-}	// namespace utils
+}	// namespace leka::utils
diff --git a/tests/functional/include/tests/utils_sleep.h b/tests/functional/include/tests/utils_sleep.h
index e177d8264..32adb8a6d 100644
--- a/tests/functional/include/tests/utils_sleep.h
+++ b/tests/functional/include/tests/utils_sleep.h
@@ -20,7 +20,7 @@
 
 using namespace std::chrono;
 
-namespace utils::sleep {
+namespace leka::utils::sleep {
 
 constexpr inline auto SERIAL_FLUSH_TIME_MS	  = 150ms;
 constexpr inline auto US_PER_S				  = 1'000'000;
@@ -142,4 +142,4 @@ inline auto get_deep_sleep_over_idle_time_ratio_for_duration(std::chrono::millis
 	return deep_sleep_ratio;
 }
 
-}	// namespace utils::sleep
+}	// namespace leka::utils::sleep
diff --git a/tests/functional/tests/deep_sleep_core_buffered_serial/suite_core_buffered_serial.cpp b/tests/functional/tests/deep_sleep_core_buffered_serial/suite_core_buffered_serial.cpp
index 09bff5c23..d532f9ca3 100644
--- a/tests/functional/tests/deep_sleep_core_buffered_serial/suite_core_buffered_serial.cpp
+++ b/tests/functional/tests/deep_sleep_core_buffered_serial/suite_core_buffered_serial.cpp
@@ -9,9 +9,9 @@
 #include "tests/utils.h"
 #include "tests/utils_sleep.h"
 
+using namespace std::chrono;
 using namespace leka;
 using namespace boost::ut;
-using namespace std::chrono;
 using namespace boost::ut::bdd;
 
 suite suite_core_buffered_serial = [] {
diff --git a/tests/functional/tests/deep_sleep_core_lcd/suite_core_lcd.cpp b/tests/functional/tests/deep_sleep_core_lcd/suite_core_lcd.cpp
index 27541f16d..59ebfbed6 100644
--- a/tests/functional/tests/deep_sleep_core_lcd/suite_core_lcd.cpp
+++ b/tests/functional/tests/deep_sleep_core_lcd/suite_core_lcd.cpp
@@ -21,9 +21,9 @@
 #include "tests/utils.h"
 #include "tests/utils_sleep.h"
 
+using namespace std::chrono;
 using namespace leka;
 using namespace boost::ut;
-using namespace std::chrono;
 using namespace boost::ut::bdd;
 
 auto backlight = CorePwm {SCREEN_BACKLIGHT_PWM};
diff --git a/tests/functional/tests/deep_sleep_core_motor/suite_core_motor.cpp b/tests/functional/tests/deep_sleep_core_motor/suite_core_motor.cpp
index 07417bead..df146ae49 100644
--- a/tests/functional/tests/deep_sleep_core_motor/suite_core_motor.cpp
+++ b/tests/functional/tests/deep_sleep_core_motor/suite_core_motor.cpp
@@ -8,9 +8,9 @@
 #include "tests/utils.h"
 #include "tests/utils_sleep.h"
 
+using namespace std::chrono;
 using namespace leka;
 using namespace boost::ut;
-using namespace std::chrono;
 using namespace boost::ut::bdd;
 
 suite suite_core_motor = [] {
diff --git a/tests/functional/tests/deep_sleep_core_pwm/suite_core_pwm.cpp b/tests/functional/tests/deep_sleep_core_pwm/suite_core_pwm.cpp
index eb0eacc9f..7f23a637e 100644
--- a/tests/functional/tests/deep_sleep_core_pwm/suite_core_pwm.cpp
+++ b/tests/functional/tests/deep_sleep_core_pwm/suite_core_pwm.cpp
@@ -9,9 +9,9 @@
 #include "tests/utils.h"
 #include "tests/utils_sleep.h"
 
+using namespace std::chrono;
 using namespace leka;
 using namespace boost::ut;
-using namespace std::chrono;
 using namespace boost::ut::bdd;
 
 suite suite_core_pwm = [] {
diff --git a/tests/functional/tests/deep_sleep_log_kit/suite_log_kit.cpp b/tests/functional/tests/deep_sleep_log_kit/suite_log_kit.cpp
index 9e615a26e..324671656 100644
--- a/tests/functional/tests/deep_sleep_log_kit/suite_log_kit.cpp
+++ b/tests/functional/tests/deep_sleep_log_kit/suite_log_kit.cpp
@@ -8,8 +8,9 @@
 #include "tests/utils.h"
 #include "tests/utils_sleep.h"
 
-using namespace boost::ut;
 using namespace std::chrono;
+using namespace leka;
+using namespace boost::ut;
 using namespace boost::ut::bdd;
 
 suite suite_log_kit = [] {
diff --git a/tests/functional/tests/deep_sleep_mbed_hal/suite_mbed_hal.cpp b/tests/functional/tests/deep_sleep_mbed_hal/suite_mbed_hal.cpp
index 442cb6728..e620b825e 100644
--- a/tests/functional/tests/deep_sleep_mbed_hal/suite_mbed_hal.cpp
+++ b/tests/functional/tests/deep_sleep_mbed_hal/suite_mbed_hal.cpp
@@ -8,8 +8,9 @@
 #include "tests/utils.h"
 #include "tests/utils_sleep.h"
 
-using namespace boost::ut;
 using namespace std::chrono;
+using namespace leka;
+using namespace boost::ut;
 using namespace boost::ut::bdd;
 
 // ? tests inspired from https://github.com/ARMmbed/mbed-os