diff --git a/target/linux/ramips/dts/mt7621_mikrotik_routerboard-m11g.dts b/target/linux/ramips/dts/mt7621_mikrotik_routerboard-m11g.dts
index 2b05f1c2f2..cb13590017 100644
--- a/target/linux/ramips/dts/mt7621_mikrotik_routerboard-m11g.dts
+++ b/target/linux/ramips/dts/mt7621_mikrotik_routerboard-m11g.dts
@@ -83,8 +83,7 @@
 	flash@0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
-		// XXX empiric value to obtain actual 10MHz SCK at the chip
-		spi-max-frequency = <3125000>;
+		spi-max-frequency = <33000000>;
 
 		partitions {
 			compatible = "fixed-partitions";
diff --git a/target/linux/ramips/dts/mt7621_mikrotik_routerboard-m33g.dts b/target/linux/ramips/dts/mt7621_mikrotik_routerboard-m33g.dts
index 490f507fa9..ebe85b09a1 100644
--- a/target/linux/ramips/dts/mt7621_mikrotik_routerboard-m33g.dts
+++ b/target/linux/ramips/dts/mt7621_mikrotik_routerboard-m33g.dts
@@ -93,7 +93,7 @@
 	flash@0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
-		spi-max-frequency = <3125000>;
+		spi-max-frequency = <33000000>;
 
 		partitions {
 			compatible = "fixed-partitions";
@@ -139,8 +139,7 @@
 	flash@1 {
 		compatible = "jedec,spi-nor";
 		reg = <1>;
-		// XXX empiric value to obtain actual 10MHz SCK at the chip
-		spi-max-frequency = <3125000>;
+		spi-max-frequency = <33000000>;
 
 		partitions {
 			compatible = "fixed-partitions";