diff --git a/boards/arm/96b_argonkey/96b_argonkey.dts b/boards/arm/96b_argonkey/96b_argonkey.dts
index 4e666efadb8..63863e2be12 100644
--- a/boards/arm/96b_argonkey/96b_argonkey.dts
+++ b/boards/arm/96b_argonkey/96b_argonkey.dts
@@ -6,6 +6,7 @@
 
 /dts-v1/;
 #include <st/f4/stm32f412Xg.dtsi>
+#include <st/f4/stm32f412c(e-g)ux-pinctrl.dtsi>
 
 / {
 	model = "Tocoding Argonkey 96boards";
@@ -46,6 +47,7 @@
 };
 
 &usart1 {
+	pinctrl-0 = <&usart1_tx_pa9 &usart1_rx_pa10>;
 	current-speed = <115200>;
 	status = "okay";
 };
diff --git a/boards/arm/96b_argonkey/pinmux.c b/boards/arm/96b_argonkey/pinmux.c
index 8854dcc4bfb..29bf094fa05 100644
--- a/boards/arm/96b_argonkey/pinmux.c
+++ b/boards/arm/96b_argonkey/pinmux.c
@@ -14,10 +14,6 @@
 
 /* pin assignments for 96boards Argonkey board */
 static const struct pin_config pinconf[] = {
-#if DT_NODE_HAS_STATUS(DT_NODELABEL(usart1), okay) && CONFIG_SERIAL
-	{STM32_PIN_PA9, STM32F4_PINMUX_FUNC_PA9_USART1_TX},
-	{STM32_PIN_PA10, STM32F4_PINMUX_FUNC_PA10_USART1_RX},
-#endif
 #if DT_NODE_HAS_STATUS(DT_NODELABEL(i2c1), okay) && CONFIG_I2C
 	{STM32_PIN_PB6, STM32F4_PINMUX_FUNC_PB6_I2C1_SCL},
 	{STM32_PIN_PB7, STM32F4_PINMUX_FUNC_PB7_I2C1_SDA},