diff --git a/homeassistant/components/lutron_caseta/__init__.py b/homeassistant/components/lutron_caseta/__init__.py
index 546bb055ca8..0408f547f25 100644
--- a/homeassistant/components/lutron_caseta/__init__.py
+++ b/homeassistant/components/lutron_caseta/__init__.py
@@ -138,6 +138,11 @@ async def async_setup_entry(
 
     devices = bridge.get_devices()
     bridge_device = devices[BRIDGE_DEVICE_ID]
+    if not config_entry.unique_id:
+        hass.config_entries.async_update_entry(
+            config_entry, unique_id=hex(bridge_device["serial"])[2:].zfill(8)
+        )
+
     buttons = bridge.buttons
     _async_register_bridge_device(hass, entry_id, bridge_device)
     button_devices = _async_register_button_devices(