diff --git a/arch/arm/boot/dts/at91rm9200.dtsi b/arch/arm/boot/dts/at91rm9200.dtsi
index 3f3149c156a8..2ad69a7fbc00 100644
--- a/arch/arm/boot/dts/at91rm9200.dtsi
+++ b/arch/arm/boot/dts/at91rm9200.dtsi
@@ -493,8 +493,8 @@
 				uart0 {
 					pinctrl_uart0: uart0-0 {
 						atmel,pins =
-							<AT91_PIOA 17 AT91_PERIPH_A AT91_PINCTRL_NONE	/* PA17 periph A */
-							 AT91_PIOA 18 AT91_PERIPH_A AT91_PINCTRL_NONE>;	/* PA18 periph A */
+							<AT91_PIOA 17 AT91_PERIPH_A AT91_PINCTRL_NONE
+							 AT91_PIOA 18 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
 					};
 
 					pinctrl_uart0_cts: uart0_cts-0 {