diff --git a/Debug/debug.c b/Debug/debug.c
index 89117bd..9acbb87 100644
--- a/Debug/debug.c
+++ b/Debug/debug.c
@@ -182,7 +182,7 @@ void USART_Printf_Init(uint32_t baudrate)
  * @return  size: Data length
  */
 __attribute__((used))
-int _write(int fd, char *buf, int size)
+int _write(__attribute__((unused)) int fd, char *buf, int size)
 {
     int i;