diff --git a/extensions-builtin/forge_legacy_preprocessors/scripts/legacy_preprocessor_loader.py b/extensions-builtin/forge_legacy_preprocessors/scripts/legacy_preprocessor_loader.py
index 883701a6..f2874c20 100644
--- a/extensions-builtin/forge_legacy_preprocessors/scripts/legacy_preprocessor_loader.py
+++ b/extensions-builtin/forge_legacy_preprocessors/scripts/legacy_preprocessor_loader.py
@@ -8,6 +8,7 @@ from modules_forge.shared import Preprocessor, PreprocessorParameter, preprocess
 # No newer preprocessors should be written in this legacy way.
 
 from legacy_preprocessors.preprocessor_meta import cn_preprocessor_modules, cn_preprocessor_unloadable, ui_preprocessor_keys, reverse_preprocessor_aliases
+from legacy_preprocessors.preprocessor import model_free_preprocessors, no_control_mode_preprocessors, flag_preprocessor_resolution, preprocessor_sliders_config, preprocessor_filters, preprocessor_filters_aliases
 
 
 class LegacyPreprocessor(Preprocessor):