diff --git a/arch/arm/boot/dts/ethernut5.dts b/arch/arm/boot/dts/ethernut5.dts
index 143b6d25bc80e9229dca3e63d5d419ce32c6c80a..8f941c2db7c654e864dd0c2420d0786e95d4fd7f 100644
--- a/arch/arm/boot/dts/ethernut5.dts
+++ b/arch/arm/boot/dts/ethernut5.dts
@@ -20,6 +20,16 @@
 		reg = <0x20000000 0x08000000>;
 	};
 
+	clocks {
+		slow_xtal {
+			clock-frequency = <32768>;
+		};
+
+		main_xtal {
+			clock-frequency = <18432000>;
+		};
+	};
+
 	ahb {
 		apb {
 			dbgu: serial@fffff200 {