diff --git a/boards/ek-lm4f120xl/include/board.h b/boards/ek-lm4f120xl/include/board.h
index f1a405a0e1..282b2aab7c 100644
--- a/boards/ek-lm4f120xl/include/board.h
+++ b/boards/ek-lm4f120xl/include/board.h
@@ -34,8 +34,8 @@ extern "C" {
  * @{
  */
 #define STDIO               UART_0
-#define STDIO_BAUDRATE      115200
-#define STDIO_RX_BUFSIZE    UART0_BUFSIZE
+#define STDIO_BAUDRATE      (115200U)
+#define STDIO_RX_BUFSIZE    (64U)
 /** @} */
 
 /**