diff --git a/pack_mm/core/core.py b/pack_mm/core/core.py
index e1b6269..650ca61 100644
--- a/pack_mm/core/core.py
+++ b/pack_mm/core/core.py
@@ -301,7 +301,7 @@ def pack_molecules(
 
     calc = choose_calculator(
         arch=arch,
-        model_path=model,
+        model=model,
         device=device,
         dispersion=dispersion,
     )