diff --git a/dts/arm/nordic/nrf52810.dtsi b/dts/arm/nordic/nrf52810.dtsi
index 5c261477e29..c773021d944 100644
--- a/dts/arm/nordic/nrf52810.dtsi
+++ b/dts/arm/nordic/nrf52810.dtsi
@@ -48,6 +48,7 @@
 			flash0: flash@0 {
 				compatible = "soc-nv-flash";
 				label = "NRF_FLASH";
+				erase-block-size = <4096>;
 				write-block-size = <4>;
 			};
 		};
diff --git a/dts/arm/nordic/nrf52811.dtsi b/dts/arm/nordic/nrf52811.dtsi
index e7f5e587449..d396996d1b1 100644
--- a/dts/arm/nordic/nrf52811.dtsi
+++ b/dts/arm/nordic/nrf52811.dtsi
@@ -52,6 +52,7 @@
 			flash0: flash@0 {
 				compatible = "soc-nv-flash";
 				label = "NRF_FLASH";
+				erase-block-size = <4096>;
 				write-block-size = <4>;
 			};
 	};