diff --git a/aiohttp_cors/mixin.py b/aiohttp_cors/mixin.py
index f5b4506..59991d7 100644
--- a/aiohttp_cors/mixin.py
+++ b/aiohttp_cors/mixin.py
@@ -18,7 +18,7 @@ class CorsViewMixin(_PreflightHandler):
     def get_request_config(cls, request, request_method):
         try:
             from . import APP_CONFIG_KEY
-            cors = request.app[APP_CONFIG_KEY]
+            cors = request.config_dict[APP_CONFIG_KEY]
         except KeyError:
             raise ValueError("aiohttp-cors is not configured.")