diff --git a/tinyusb/osal/osal_none.h b/tinyusb/osal/osal_none.h
index 3cb869bd1..4f59361b5 100644
--- a/tinyusb/osal/osal_none.h
+++ b/tinyusb/osal/osal_none.h
@@ -98,6 +98,7 @@ static inline uint32_t osal_tick_get(void)
 #define OSAL_TASK_LOOP_BEGIN \
   ATTR_UNUSED static uint32_t timeout = 0;\
   static uint16_t state = 0;\
+  (void) timeout; /* timemout can possible unsued */ \
   switch(state) { \
     case 0: { \