diff --git a/app/api.py b/app/api.py
index ded8dae0..86b41df1 100644
--- a/app/api.py
+++ b/app/api.py
@@ -35,7 +35,7 @@
 else:
     # we cache query builder and result processor here for faster processing
     FILTER_QUERY_BUILDER = build_elasticsearch_query_builder(config.CONFIG)
-    RESULT_PROCESSOR = load_result_processor(config.CONFIG.result_processor)
+    RESULT_PROCESSOR = load_result_processor(config.CONFIG)
 
 
 app = FastAPI(
diff --git a/app/postprocessing.py b/app/postprocessing.py
index 08b2b07e..38da8280 100644
--- a/app/postprocessing.py
+++ b/app/postprocessing.py
@@ -46,13 +46,18 @@ def process_after(self, result: JSONType) -> JSONType:
         return result
 
 
-def load_result_processor(result_processor: str | None) -> BaseResultProcessor | None:
+def load_result_processor(config: Config) -> BaseResultProcessor | None:
+    """Load the result processor class from the config.
+
+    :param config: the config object
+    :return: the initialized result processor
+    """
     result_processor_cls = (
-        load_class_object_from_string(result_processor)
-        if result_processor is not None
+        load_class_object_from_string(config.result_processor)
+        if config.result_processor is not None
         else BaseResultProcessor
     )
-    return result_processor_cls(result_processor)
+    return result_processor_cls(config)
 
 
 def process_taxonomy_completion_response(response: Response) -> JSONType: