diff --git a/utils/extract_velcube.py b/utils/extract_velcube.py
index d936ebb..79fe730 100644
--- a/utils/extract_velcube.py
+++ b/utils/extract_velcube.py
@@ -45,6 +45,6 @@ def extract_from_pp(pp):
     write_data(f"{pp.path_out}/{pp.run}_{pp.num}_velrho.data", vel, dens)
 
 
-def extract(path, snap_number):
-    pp = SnapshotProcessor(path, snap_number, params="../turbox_params.yml")
+def extract(path, snap_number, params=None):
+    pp = SnapshotProcessor(path, snap_number, params=params)
     extract_from_pp(pp)