diff --git a/lib/open_api/processor.ex b/lib/open_api/processor.ex
index 6595c10..1e329a2 100644
--- a/lib/open_api/processor.ex
+++ b/lib/open_api/processor.ex
@@ -439,7 +439,7 @@ defmodule OpenAPI.Processor do
           end)
 
         field = %Field{
-          name: field_name,
+          name: OpenAPI.Processor.Naming.normalize_identifier(field_name, :snake),
           nullable: nullable?,
           private: false,
           required: required?,