diff --git a/arch/riscv/boot/dts/spacemit/k1-x_deb1.dts b/arch/riscv/boot/dts/spacemit/k1-x_deb1.dts
index 20458d4c83c4917b5784b26c53358afedf65d73c..c136fca9ac86576d9bc0c93dcb6afa5dd8abc5af 100644
--- a/arch/riscv/boot/dts/spacemit/k1-x_deb1.dts
+++ b/arch/riscv/boot/dts/spacemit/k1-x_deb1.dts
@@ -818,6 +818,7 @@ &pcie1_rc {
 &pcie2_rc {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_pcie2_4>;
+	num-lanes = <1>;
 	status = "okay";
 };