diff --git a/postprocessor.py b/postprocessor.py
index 680dbc1..56bd1c5 100644
--- a/postprocessor.py
+++ b/postprocessor.py
@@ -394,10 +394,10 @@ class PostProcessor(HDF5Container):
 
     def getter_pos_disk(self, dset):
         """
-        Returns the position in normalized units centered on the position of the star
+        Returns the position in normalized and centered units
         """
         pos = dset.points
-        pos = pos - (np.array(self.pp_params.disk.pos_star) / self.lbox)
+        pos = pos - np.array(self.save.root.maps._v_attrs.center)
         return pos
 
     def getter_vect_r(self, dset, name_vect):