diff --git a/esphome/components/web_server/__init__.py b/esphome/components/web_server/__init__.py
index 44212c58e0..5f16f1af87 100644
--- a/esphome/components/web_server/__init__.py
+++ b/esphome/components/web_server/__init__.py
@@ -122,7 +122,7 @@ def _validate_no_sorting_component(
                     )
 
 
-def _final_validate_sorting(config):
+def _final_validate_sorting(config: ConfigType) -> ConfigType:
     if (webserver_version := config.get(CONF_VERSION)) != 3:
         _validate_no_sorting_component(
             CONF_SORTING_WEIGHT, webserver_version, fv.full_config.get()