diff --git a/drivers/pinmux/stm32/pinmux_board_nucleo_l432kc.c b/drivers/pinmux/stm32/pinmux_board_nucleo_l432kc.c
index 9ee4e4a48f1..95254a6b9f9 100644
--- a/drivers/pinmux/stm32/pinmux_board_nucleo_l432kc.c
+++ b/drivers/pinmux/stm32/pinmux_board_nucleo_l432kc.c
@@ -22,7 +22,7 @@ static const struct pin_config pinconf[] = {
 #endif	/* CONFIG_UART_STM32_PORT_1 */
 #ifdef CONFIG_UART_STM32_PORT_2
 	{STM32_PIN_PA2, STM32L4X_PINMUX_FUNC_PA2_USART2_TX},
-	{STM32_PIN_PA3, STM32L4X_PINMUX_FUNC_PA3_USART2_RX},
+	{STM32_PIN_PA15, STM32L4X_PINMUX_FUNC_PA15_USART2_RX},
 #endif	/* CONFIG_UART_STM32_PORT_2 */
 #ifdef CONFIG_I2C_1
 	{STM32_PIN_PB6, STM32L4X_PINMUX_FUNC_PB6_I2C1_SCL},
diff --git a/drivers/pinmux/stm32/pinmux_stm32l4x.h b/drivers/pinmux/stm32/pinmux_stm32l4x.h
index 92a732f8c46..29e8d9c09c3 100644
--- a/drivers/pinmux/stm32/pinmux_stm32l4x.h
+++ b/drivers/pinmux/stm32/pinmux_stm32l4x.h
@@ -23,6 +23,7 @@
 #define STM32L4X_PINMUX_FUNC_PA9_USART1_TX STM32_PINMUX_FUNC_ALT_7
 #define STM32L4X_PINMUX_FUNC_PA10_USART1_RX STM32_PINMUX_FUNC_ALT_7
 #define STM32L4X_PINMUX_FUNC_PA15_PWM2_CH1 STM32_PINMUX_FUNC_ALT_1
+#define STM32L4X_PINMUX_FUNC_PA15_USART2_RX STM32_PINMUX_FUNC_ALT_3
 
 /* Port B */
 #define STM32L4X_PINMUX_FUNC_PB3_SPI1_SCK STM32_PINMUX_FUNC_ALT_5