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 c354c607..d27daa5a 100644
--- a/extensions-builtin/forge_legacy_preprocessors/scripts/legacy_preprocessor_loader.py
+++ b/extensions-builtin/forge_legacy_preprocessors/scripts/legacy_preprocessor_loader.py
@@ -1,10 +1,30 @@
+from modules_forge.shared import Preprocessor, PreprocessorParameter, preprocessor_dir, load_file_from_url, add_preprocessor
+
 # This is a python script to convert all old preprocessors to new format.
 # However, the old preprocessors are not very memory effective
-# and eventually we should move all old preprocessors to new format
+# and eventually we should move all old preprocessors to new format manually
 # see also the forge_preprocessor_normalbae/scripts/preprocessor_normalbae for
 # how to make better implementation of preprocessors.
 # No newer preprocessors should be written in this legacy way.
 
 from legacy_preprocessors.preprocessor_meta import cn_preprocessor_modules, cn_preprocessor_unloadable
 
+
+class LegacyPreprocessor(Preprocessor):
+    def __init__(self):
+        super().__init__()
+        legacy_call_function = None
+        legacy_unload_function = None
+        return
+
+
+legacy_preprocessors = {}
+
+for k, v in cn_preprocessor_modules.items():
+    p = LegacyPreprocessor()
+    p.name = k
+    p.legacy_call_function = v
+    legacy_preprocessors[k] = p
+
+
 a = 0