diff --git a/target/linux/ramips/dts/RTN56U.dts b/target/linux/ramips/dts/RTN56U.dts
index 05836cfe66..db638f79c4 100644
--- a/target/linux/ramips/dts/RTN56U.dts
+++ b/target/linux/ramips/dts/RTN56U.dts
@@ -12,9 +12,10 @@
 
 	palmbus@10000000 {
 		sysc@0 {
-			ralink,pinmux = "uartlite", "spi";
+			ralink,pinmux = "uartlite";
 			ralink,gpiomux = "i2c", "jtag";
 			ralink,uartmux = "gpio";
+			ralink,pcimux = "pci-fnc";
 			ralink,wdtmux = <0>;
 		};