diff --git a/linux/devicetree/wally-vcu108.dts b/linux/devicetree/wally-vcu108.dts
index 211631345..bb9200822 100644
--- a/linux/devicetree/wally-vcu108.dts
+++ b/linux/devicetree/wally-vcu108.dts
@@ -102,7 +102,7 @@
 			mmc@0 {
 				compatible = "mmc-spi-slot";
 				reg = <0>;
-				spi-max-frequency = <1000000>;
+				spi-max-frequency = <400000>;
 				voltage-ranges = <3300 3300>;
 				disable-wp;
 				// gpios = <&gpio0 6 1>;