diff --git a/ports/stm32/boards/NUCLEO_WB55/mpconfigboard.h b/ports/stm32/boards/NUCLEO_WB55/mpconfigboard.h
index 206134941..179369d94 100644
--- a/ports/stm32/boards/NUCLEO_WB55/mpconfigboard.h
+++ b/ports/stm32/boards/NUCLEO_WB55/mpconfigboard.h
@@ -22,6 +22,8 @@
 // UART buses
 #define MICROPY_HW_UART1_TX         (pin_B6)
 #define MICROPY_HW_UART1_RX         (pin_B7)
+#define MICROPY_HW_LPUART1_TX       (pin_A2)
+#define MICROPY_HW_LPUART1_RX       (pin_A3)
 // USART 1 is connected to the virtual com port on the ST-LINK
 #define MICROPY_HW_UART_REPL        PYB_UART_1
 #define MICROPY_HW_UART_REPL_BAUD   115200