diff --git a/boards/pca10000/include/board.h b/boards/pca10000/include/board.h
index b9953d9b52..7a8c9a22cf 100644
--- a/boards/pca10000/include/board.h
+++ b/boards/pca10000/include/board.h
@@ -41,6 +41,7 @@
  */
 #define STDIO               UART_0
 #define STDIO_BAUDRATE      (115200U)
+#define STDIO_RX_BUFSIZE    (64U)
 /** @} */
 
 /**
diff --git a/boards/pca10005/include/board.h b/boards/pca10005/include/board.h
index c07cc8fe63..1f244616ae 100644
--- a/boards/pca10005/include/board.h
+++ b/boards/pca10005/include/board.h
@@ -35,6 +35,7 @@
  */
 #define STDIO               UART_0
 #define STDIO_BAUDRATE      (115200U)
+#define STDIO_RX_BUFSIZE    (64U)
 /** @} */
 
 /**
diff --git a/boards/yunjia-nrf51822/include/board.h b/boards/yunjia-nrf51822/include/board.h
index d02c7a284d..aac39a34e4 100644
--- a/boards/yunjia-nrf51822/include/board.h
+++ b/boards/yunjia-nrf51822/include/board.h
@@ -34,6 +34,7 @@
  */
 #define STDIO               UART_0
 #define STDIO_BAUDRATE      (115200U)
+#define STDIO_RX_BUFSIZE    (64U)
 /** @} */
 
 /**