diff --git a/homeassistant/components/guardian/entity.py b/homeassistant/components/guardian/entity.py
index c48c87afa01d..760b9423afd6 100644
--- a/homeassistant/components/guardian/entity.py
+++ b/homeassistant/components/guardian/entity.py
@@ -74,7 +74,7 @@ class ValveControllerEntity(GuardianEntity):
         self._attr_device_info = DeviceInfo(
             identifiers={(DOMAIN, entry.data[CONF_UID])},
             manufacturer="Elexa",
-            model=self._diagnostics_coordinator.data["firmware"],
+            sw_version=self._diagnostics_coordinator.data["firmware"],
             name=f"Guardian valve controller {entry.data[CONF_UID]}",
         )
         self._attr_unique_id = f"{entry.data[CONF_UID]}_{description.key}"