diff --git a/boards/arm/nucleo_h743zi/nucleo_h743zi.dts b/boards/arm/nucleo_h743zi/nucleo_h743zi.dts
index 254f08f653d..d94fba226c9 100644
--- a/boards/arm/nucleo_h743zi/nucleo_h743zi.dts
+++ b/boards/arm/nucleo_h743zi/nucleo_h743zi.dts
@@ -6,6 +6,7 @@
 
 /dts-v1/;
 #include <st/h7/stm32h743Xi.dtsi>
+#include <st/h7/stm32h743zitx-pinctrl.dtsi>
 #include "arduino_r3_connector.dtsi"
 
 / {
@@ -57,6 +58,7 @@
 };
 
 &usart3 {
+	pinctrl-0 = <&usart3_tx_pd8 &usart3_rx_pd9>;
 	current-speed = <115200>;
 	status = "okay";
 };
diff --git a/boards/arm/nucleo_h743zi/pinmux.c b/boards/arm/nucleo_h743zi/pinmux.c
index fa4053b4214..f77dd9ce606 100644
--- a/boards/arm/nucleo_h743zi/pinmux.c
+++ b/boards/arm/nucleo_h743zi/pinmux.c
@@ -14,10 +14,6 @@
 
 /* NUCLEO-H743ZI pin configurations */
 static const struct pin_config pinconf[] = {
-#if DT_NODE_HAS_STATUS(DT_NODELABEL(usart3), okay) && CONFIG_SERIAL
-	{ STM32_PIN_PD8, STM32H7_PINMUX_FUNC_PD8_USART3_TX },
-	{ STM32_PIN_PD9, STM32H7_PINMUX_FUNC_PD9_USART3_RX },
-#endif
 #if DT_NODE_HAS_STATUS(DT_NODELABEL(i2c1), okay) && CONFIG_I2C
 	{ STM32_PIN_PB8, STM32H7_PINMUX_FUNC_PB8_I2C1_SCL },
 	{ STM32_PIN_PB9, STM32H7_PINMUX_FUNC_PB9_I2C1_SDA },