diff --git a/lib/rubocop/cop/rails/deprecated_active_model_errors_methods.rb b/lib/rubocop/cop/rails/deprecated_active_model_errors_methods.rb
index f07dc156f1..302532a488 100644
--- a/lib/rubocop/cop/rails/deprecated_active_model_errors_methods.rb
+++ b/lib/rubocop/cop/rails/deprecated_active_model_errors_methods.rb
@@ -160,7 +160,7 @@ def receiver_matcher(node)
         end
 
         def model_file?
-          processed_source.buffer.name.include?('/models/')
+          processed_source.file_path.include?('/models/')
         end
       end
     end