diff --git a/boards/iot-lab_M3/include/board.h b/boards/iot-lab_M3/include/board.h
index 70be469442308397f28b7ec962ad171cd281735e..2e5965a92d55131e3270294914b22b902cb89d8e 100644
--- a/boards/iot-lab_M3/include/board.h
+++ b/boards/iot-lab_M3/include/board.h
@@ -43,7 +43,11 @@ extern "C" {
  * @{
  */
 #define STDIO               UART_0
-#define STDIO_BAUDRATE      (500000U)
+
+#ifndef STDIO_BAUDRATE
+#   define STDIO_BAUDRATE   (500000U)
+#endif
+
 #define STDIO_RX_BUFSIZE    (64U)
 /** @} */