diff --git a/src/drivers/src/ws2812_cf2.c b/src/drivers/src/ws2812_cf2.c
index 6d5d521292..c946d2c6a8 100644
--- a/src/drivers/src/ws2812_cf2.c
+++ b/src/drivers/src/ws2812_cf2.c
@@ -169,7 +169,7 @@ static int current_led = 0;
 static int total_led = 0;
 static uint8_t (*color_led)[3] = NULL;
 
-void ws2812Send(uint8_t (*color)[3], int len)
+void ws2812Send(uint8_t (*color)[3], uint16_t len)
 {
     int i;
 	if(len<1) return;
diff --git a/src/lib/FreeRTOS/tasks.c b/src/lib/FreeRTOS/tasks.c
index 11ca0e976b..6adf9db6a6 100644
--- a/src/lib/FreeRTOS/tasks.c
+++ b/src/lib/FreeRTOS/tasks.c
@@ -2200,7 +2200,7 @@ BaseType_t xSwitchRequired = pdFALSE;
 #endif /* configUSE_APPLICATION_TASK_TAG */
 /*-----------------------------------------------------------*/
 
-void vTaskSwitchContext( void )
+void __attribute__((used)) vTaskSwitchContext( void )
 {
 	if( uxSchedulerSuspended != ( UBaseType_t ) pdFALSE )
 	{