diff --git a/target/linux/ramips/dts/mt7621_edimax_rg21s.dts b/target/linux/ramips/dts/mt7621_edimax_rg21s.dts
index 3d88d588ac..be38beef12 100644
--- a/target/linux/ramips/dts/mt7621_edimax_rg21s.dts
+++ b/target/linux/ramips/dts/mt7621_edimax_rg21s.dts
@@ -68,7 +68,7 @@
 	flash@0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
-		spi-max-frequency = <10000000>;
+		spi-max-frequency = <40000000>;
 
 		partitions {
 			compatible = "fixed-partitions";