diff --git a/MDANSE/Src/MDANSE/Framework/Configurators/TrajectoryFilterConfigurator.py b/MDANSE/Src/MDANSE/Framework/Configurators/TrajectoryFilterConfigurator.py
index 98def70b7..1cd32130c 100644
--- a/MDANSE/Src/MDANSE/Framework/Configurators/TrajectoryFilterConfigurator.py
+++ b/MDANSE/Src/MDANSE/Framework/Configurators/TrajectoryFilterConfigurator.py
@@ -88,7 +88,7 @@ def filter_description_string(filter=_filter, settings=_settings) -> str:
             + "}"
         )
 
-    _default = filter_description_string()
+    _default = filter_description_string.__func__()
 
     @property
     def settings(self):