diff --git a/brainunit/_base.py b/brainunit/_base.py
index 32dd5d7..8222dd2 100644
--- a/brainunit/_base.py
+++ b/brainunit/_base.py
@@ -3360,13 +3360,13 @@ def calculate_scale(
   --------
   >>> set_default_magnitude({'m': -3, 'kg': -9})
   >>> calculate_scale(get_or_create_dimension(m=1))
-  -3
+  3
   >>> calculate_scale(get_or_create_dimension(kg=1))
-  -9
+  9
   >>> calculate_scale(get_or_create_dimension(m=1, kg=1))
-  -12
+  12
   >>> calculate_scale(get_or_create_dimension(m=2, kg=-1))
-  3
+  -3
   """
   for dim, magnitude in zip(unit._dims, _default_magnitude.values()):
     scale -= dim * magnitude