diff --git a/src/neuroconv/utils/json_schema.py b/src/neuroconv/utils/json_schema.py
index 902f99e7d..a7e6e0518 100644
--- a/src/neuroconv/utils/json_schema.py
+++ b/src/neuroconv/utils/json_schema.py
@@ -142,7 +142,6 @@ def get_json_schema_from_method_signature(method: Callable, exclude: Optional[li
 
         # If no annotation is provided (inspect._empty), use Any instead
         annotation = Any if parameter.annotation is inspect._empty else parameter.annotation
-        annotation = parameter.annotation
 
         # Pydantic uses ellipsis for required
         pydantic_default = ... if parameter.default is inspect._empty else parameter.default