diff --git a/dts/arm/st/stm32l4.dtsi b/dts/arm/st/stm32l4.dtsi
index 4f15603e7f6..641eb7272c3 100644
--- a/dts/arm/st/stm32l4.dtsi
+++ b/dts/arm/st/stm32l4.dtsi
@@ -24,7 +24,10 @@
 	};
 
 	flash0: flash@8000000 {
+		compatible = "soc-nv-flash";
 		reg = <0x08000000 DT_FLASH_SIZE>;
+
+		write-block-size = <8>;
 	};
 
 	sram0: memory@20000000 {