diff --git a/target/linux/ramips/dts/mt7620a_iptime.dtsi b/target/linux/ramips/dts/mt7620a_iptime.dtsi
index 3e2378aa60b..26727893715 100644
--- a/target/linux/ramips/dts/mt7620a_iptime.dtsi
+++ b/target/linux/ramips/dts/mt7620a_iptime.dtsi
@@ -21,7 +21,7 @@
 	flash@0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
-		spi-max-frequency = <50000000>;
+		spi-max-frequency = <40000000>;
 
 		partitions {
 			compatible = "fixed-partitions";