diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/TARGET_EVK/PeripheralPins.c b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/TARGET_EVK/PeripheralPins.c
index c1b108c24c..113e9b0d3c 100644
--- a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/TARGET_EVK/PeripheralPins.c
+++ b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/TARGET_EVK/PeripheralPins.c
@@ -51,11 +51,13 @@ const PinMap PinMap_I2C_SCL[] = {
 /************UART***************/
 const PinMap PinMap_UART_TX[] = {
     {GPIO_AD_B0_12, UART_1, 2},
+    {GPIO_AD_B1_06, UART_3, 2},
     {NC  ,  NC    , 0}
 };
 
 const PinMap PinMap_UART_RX[] = {
     {GPIO_AD_B0_13, UART_1, 2},
+    {GPIO_AD_B1_07, UART_3, 2},
     {NC  ,  NC    , 0}
 };