diff --git a/pyqn/base_unit.py b/pyqn/base_unit.py
index 04aec3c..3fee18e 100644
--- a/pyqn/base_unit.py
+++ b/pyqn/base_unit.py
@@ -136,7 +136,7 @@ def __str__(self):
 ]),
 
 ('Non-SI mass units', [
-BaseUnit('u', 'atomic mass unit', 'mass', 1.660538921e-27, '', '', d_mass),
+BaseUnit('u', 'atomic mass unit', 'mass', 1.660538921e-27, '', 'u', d_mass),
 BaseUnit('amu', 'atomic mass unit', 'mass', 1.660538921e-27, '', 'am', d_mass),
 BaseUnit('Da', 'dalton', 'mass', 1.660538921e-27, '', 'Da', d_mass),
 BaseUnit('m_e', 'electron mass', 'mass', 9.10938291e-31, '', 'm_e', d_mass),
diff --git a/setup.py b/setup.py
index 90a98fb..d7a39cd 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 from setuptools import setup, find_packages
 setup(
     name = 'pyqn',
-    version = '1.2.1',
+    version = '1.2.2',
     packages = find_packages(),
     author = 'Christian Hill',
     url = 'https://github.com/xnx/pyqn',