diff --git a/custom_components/mqtt_basic_async/__init__.py b/custom_components/mqtt_basic_async/__init__.py
index f482cf5..5124cfc 100644
--- a/custom_components/mqtt_basic_async/__init__.py
+++ b/custom_components/mqtt_basic_async/__init__.py
@@ -31,9 +31,18 @@
 DEFAULT_TOPIC = 'home-assistant/mqtt_example'
 
 # Schema to validate the configured MQTT topic
-CONFIG_SCHEMA = vol.Schema({
-    vol.Optional(CONF_TOPIC, default=DEFAULT_TOPIC): mqtt.valid_subscribe_topic
-})
+CONFIG_SCHEMA = vol.Schema(
+    {
+        DOMAIN: vol.Schema(
+            {
+                vol.Optional(
+                    CONF_TOPIC, default=DEFAULT_TOPIC
+                ): mqtt.valid_subscribe_topic
+            }
+        )
+    },
+    extra=vol.ALLOW_EXTRA,
+)
 
 
 async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool: