diff --git a/arch/arm/boot/dts/nxp/lpc/lpc18xx.dtsi b/arch/arm/boot/dts/nxp/lpc/lpc18xx.dtsi
index d212ca252b06..152e98cf0c4e 100644
--- a/arch/arm/boot/dts/nxp/lpc/lpc18xx.dtsi
+++ b/arch/arm/boot/dts/nxp/lpc/lpc18xx.dtsi
@@ -537,3 +537,7 @@
 		};
 	};
 };
+
+&nvic {
+	arm,num-irq-priority-bits = <3>;
+};