diff --git a/arch/arm/boot/dts/sh73a0-kzm9g-reference.dts b/arch/arm/boot/dts/sh73a0-kzm9g-reference.dts
index 939be1299ca6..3d912ea8fef4 100644
--- a/arch/arm/boot/dts/sh73a0-kzm9g-reference.dts
+++ b/arch/arm/boot/dts/sh73a0-kzm9g-reference.dts
@@ -182,6 +182,10 @@
 	status = "ok";
 };
 
+&extal2_clk {
+	clock-frequency = <48000000>;
+};
+
 &i2c0 {
 	status = "okay";
 	as3711@40 {