diff --git a/polytope_server/common/datasource/polytope.py b/polytope_server/common/datasource/polytope.py
index def2a9e..4302ee4 100644
--- a/polytope_server/common/datasource/polytope.py
+++ b/polytope_server/common/datasource/polytope.py
@@ -157,7 +157,7 @@ def retrieve(self, request):
         cf = conf.model_dump()
         cf["options"] = self.polytope_options
 
-        p = PolytopeMars(cf)
+        p = PolytopeMars(cf, None)
 
         self.output = p.extract(r)
         self.output = json.dumps(self.output).encode("utf-8")