diff --git a/homeassistant/components/demo/number.py b/homeassistant/components/demo/number.py
index 7a9baf045e5d..02ab1a2a9891 100644
--- a/homeassistant/components/demo/number.py
+++ b/homeassistant/components/demo/number.py
@@ -99,11 +99,11 @@ class DemoNumber(NumberEntity):
         self._attr_mode = mode
 
         if native_min_value is not None:
-            self._attr_min_value = native_min_value
+            self._attr_native_min_value = native_min_value
         if native_max_value is not None:
-            self._attr_max_value = native_max_value
+            self._attr_native_max_value = native_max_value
         if native_step is not None:
-            self._attr_step = native_step
+            self._attr_native_step = native_step
 
         self._attr_device_info = DeviceInfo(
             identifiers={