diff --git a/dts/bindings/flash_controller/zephyr,sim-flash.yaml b/dts/bindings/flash_controller/zephyr,sim-flash.yaml
index 532a326c2d1..21b78b75012 100644
--- a/dts/bindings/flash_controller/zephyr,sim-flash.yaml
+++ b/dts/bindings/flash_controller/zephyr,sim-flash.yaml
@@ -9,6 +9,7 @@ include: base.yaml
 properties:
   erase-value:
     type: int
+    enum: [0xff, 0x00]
     description: Value of erased flash cell
   memory-region:
     type: phandle