diff --git a/src/sdf/dsres.py b/src/sdf/dsres.py
index 93b88ca..8f78783 100644
--- a/src/sdf/dsres.py
+++ b/src/sdf/dsres.py
@@ -147,6 +147,7 @@ def _load_mat(filename: str) -> Group:
                 unit=unit,
                 display_unit=display_unit,
                 data=data,
+                is_scale=True,
             )
             ds_time = ds
         elif d == 1: