diff --git a/homeassistant/components/plex/__init__.py b/homeassistant/components/plex/__init__.py
index 6dabc5ad594..3e52b9f54ba 100644
--- a/homeassistant/components/plex/__init__.py
+++ b/homeassistant/components/plex/__init__.py
@@ -75,7 +75,11 @@ SERVER_CONFIG_SCHEMA = vol.Schema(
     )
 )
 
-CONFIG_SCHEMA = vol.Schema({PLEX_DOMAIN: SERVER_CONFIG_SCHEMA}, extra=vol.ALLOW_EXTRA)
+CONFIG_SCHEMA = vol.Schema(
+    cv.deprecated(PLEX_DOMAIN, invalidation_version="0.111"),
+    {PLEX_DOMAIN: SERVER_CONFIG_SCHEMA},
+    extra=vol.ALLOW_EXTRA,
+)
 
 _LOGGER = logging.getLogger(__package__)