diff --git a/src/apify/_configuration.py b/src/apify/_configuration.py
index 856c5fd0..ddf55513 100644
--- a/src/apify/_configuration.py
+++ b/src/apify/_configuration.py
@@ -505,7 +505,7 @@ def from_configuration(cls, configuration: CrawleeConfiguration) -> Configuratio
         # Due to known Pydantic issue https://github.com/pydantic/pydantic/issues/9516, creating new instance of
         # Configuration from existing one in situation where environment can have some fields set by alias is very
         # unpredictable. Use the stable workaround.
-        for name in configuration.model_fields:
+        for name in type(configuration).model_fields:
             setattr(apify_configuration, name, getattr(configuration, name))
 
         return apify_configuration