diff --git a/sup3r/preprocessing/data_handlers/factory.py b/sup3r/preprocessing/data_handlers/factory.py
index 1115ec792..fa22a2923 100644
--- a/sup3r/preprocessing/data_handlers/factory.py
+++ b/sup3r/preprocessing/data_handlers/factory.py
@@ -352,6 +352,10 @@ def __init__(self, file_paths, features='all', **kwargs):
                 kwargs for parent class, except for FeatureRegistry and
                 BaseLoader
             """
+
+            if 'FeatureRegistry' in kwargs:
+                self.FEATURE_REGISTRY.update(kwargs.pop('FeatureRegistry'))
+
             super().__init__(
                 file_paths,
                 features=features,