diff --git a/configs/efm32-g8xx-stk/include/board.h b/configs/efm32-g8xx-stk/include/board.h
index 6870a576598..9595a8e21c2 100644
--- a/configs/efm32-g8xx-stk/include/board.h
+++ b/configs/efm32-g8xx-stk/include/board.h
@@ -206,6 +206,8 @@
  *   U0_TX #1 PE0  **AVAILABLE at TP129**
  */
 
+#define BOARD_UART0_RX_GPIO        (GPIO_PORTE|GPIO_PIN1)
+#define BOARD_UART0_TX_GPIO        (GPIO_PORTE|GPIO_PIN0)
 #define BOARD_UART0_ROUTE_LOCATION _USART_ROUTE_LOCATION_LOC1
 
 /****************************************************************************
diff --git a/configs/olimex-efm32g880f128-stk/include/board.h b/configs/olimex-efm32g880f128-stk/include/board.h
index 45fd4fa15cd..f2d844fdeb4 100644
--- a/configs/olimex-efm32g880f128-stk/include/board.h
+++ b/configs/olimex-efm32g880f128-stk/include/board.h
@@ -237,6 +237,8 @@
  *   U0_TX #1 PE0  **AVAILABLE at EXT-18**
  */
 
+#define BOARD_UART0_RX_GPIO        (GPIO_PORTE|GPIO_PIN1)
+#define BOARD_UART0_TX_GPIO        (GPIO_PORTE|GPIO_PIN0)
 #define BOARD_UART0_ROUTE_LOCATION _USART_ROUTE_LOCATION_LOC1
 
 /* LEUART1:
@@ -245,6 +247,8 @@
  *   LEU1_TX #0 PC6  LEU1_TX to DB-9 connector
  */
 
+#define BOARD_LEUART1_RX_GPIO        (GPIO_PORTC|GPIO_PIN7)
+#define BOARD_LEUART1_TX_GPIO        (GPIO_PORTC|GPIO_PIN6)
 #define BOARD_LEUART1_ROUTE_LOCATION _LEUART_ROUTE_LOCATION_LOC0
 
 /****************************************************************************