diff --git a/examples/device/cdc_msc_hid/src/main.c b/examples/device/cdc_msc_hid/src/main.c
index fc2f2aad..8087adbb 100644
--- a/examples/device/cdc_msc_hid/src/main.c
+++ b/examples/device/cdc_msc_hid/src/main.c
@@ -49,8 +49,8 @@ static uint32_t blink_interval_ms = BLINK_NOT_MOUNTED;
 
 void led_blinking_task(void);
 
-extern void cdc_task(void);
-extern void hid_task(void);
+void cdc_task(void);
+void hid_task(void);
 
 /*------------- MAIN -------------*/
 int main(void)
diff --git a/examples/device/cdc_msc_hid_freertos/Makefile b/examples/device/cdc_msc_hid_freertos/Makefile
index 825ff9f7..3a39f460 100644
--- a/examples/device/cdc_msc_hid_freertos/Makefile
+++ b/examples/device/cdc_msc_hid_freertos/Makefile
@@ -20,7 +20,10 @@ SRC_C += \
 	lib/FreeRTOS/Source/queue.c \
 	lib/FreeRTOS/Source/tasks.c \
 	lib/FreeRTOS/Source/timers.c \
-	lib/FreeRTOS/Source/portable/GCC/$(FREERTOS_PORT)/port.c \
 	lib/FreeRTOS/Source/portable/MemMang/heap_4.c \
+	lib/FreeRTOS/Source/portable/GCC/$(FREERTOS_PORT)/port.c \
+
+# FreeRTOS (lto + Os) linker issue
+LDFLAGS += -Wl,--undefined=vTaskSwitchContext
 
 include ../../rules.mk
diff --git a/examples/device/cdc_msc_hid_freertos/ses/nrf5x/nrf5x.emProject b/examples/device/cdc_msc_hid_freertos/ses/nrf5x/nrf5x.emProject
index ee387958..f01b26d2 100644
--- a/examples/device/cdc_msc_hid_freertos/ses/nrf5x/nrf5x.emProject
+++ b/examples/device/cdc_msc_hid_freertos/ses/nrf5x/nrf5x.emProject
@@ -141,7 +141,6 @@
           <file file_name="../../../../../lib/FreeRTOS/Source/tasks.c" />
           <file file_name="../../../../../lib/FreeRTOS/Source/timers.c" />
         </folder>
-        <file file_name="../../../../../lib/FreeRTOS/freertos_hook.c" />
       </folder>
     </folder>
     <configuration
diff --git a/lib/FreeRTOS/freertos_hook.c b/examples/device/cdc_msc_hid_freertos/src/freertos_hook.c
similarity index 100%
rename from lib/FreeRTOS/freertos_hook.c
rename to examples/device/cdc_msc_hid_freertos/src/freertos_hook.c
diff --git a/examples/device/cdc_msc_hid_freertos/src/main.c b/examples/device/cdc_msc_hid_freertos/src/main.c
index f10c81d7..2cd34ddd 100644
--- a/examples/device/cdc_msc_hid_freertos/src/main.c
+++ b/examples/device/cdc_msc_hid_freertos/src/main.c
@@ -55,6 +55,8 @@ TimerHandle_t blink_tm;
 
 void led_blinky_cb(TimerHandle_t xTimer);
 void usb_device_task(void* param);
+void cdc_task(void* params);
+void hid_task(void* params);
 
 /*------------- MAIN -------------*/
 int main(void)
@@ -72,12 +74,10 @@ int main(void)
 
   // Create task
 #if CFG_TUD_CDC
-  extern void cdc_task(void* params);
   xTaskCreate( cdc_task, "cdc", 128, NULL, configMAX_PRIORITIES-2, NULL);
 #endif
 
 #if CFG_TUD_HID
-  extern void hid_task(void* params);
   xTaskCreate( hid_task, "hid", 128, NULL, configMAX_PRIORITIES-2, NULL);
 #endif
 
diff --git a/examples/device/cdc_msc_hid_freertos/ses/nrf5x/FreeRTOSConfig.h b/hw/mcu/nordic/FreeRTOSConfig.h
similarity index 98%
rename from examples/device/cdc_msc_hid_freertos/ses/nrf5x/FreeRTOSConfig.h
rename to hw/mcu/nordic/FreeRTOSConfig.h
index 75415862..53f72a06 100644
--- a/examples/device/cdc_msc_hid_freertos/ses/nrf5x/FreeRTOSConfig.h
+++ b/hw/mcu/nordic/FreeRTOSConfig.h
@@ -69,7 +69,7 @@
 /* Hook function related definitions. */
 #define configUSE_IDLE_HOOK                    0
 #define configUSE_TICK_HOOK                    0
-#define configUSE_MALLOC_FAILED_HOOK           1
+#define configUSE_MALLOC_FAILED_HOOK           0 // cause nested extern warning
 #define configCHECK_FOR_STACK_OVERFLOW         2
 
 /* Run time and task stats gathering related definitions. */