diff --git a/src/scgenerator/physics/units.py b/src/scgenerator/physics/units.py
index dba43cc..71e2d95 100644
--- a/src/scgenerator/physics/units.py
+++ b/src/scgenerator/physics/units.py
@@ -146,7 +146,7 @@ def um(l: _T) -> _T:
     return l * 1e-6
 
 
-@nm.inverse
+@um.inverse
 def um_inv(l: _T) -> _T:
     return l * 1e6