diff --git a/README.rst b/README.rst
index 1aa35fd..5b934ff 100644
--- a/README.rst
+++ b/README.rst
@@ -80,3 +80,4 @@ Initiative `licenses page <http://www.opensource.org/licenses>`_
 for details on individual licenses.
 
 See `doc/user/license.rst <doc/user/license.rst>`_ for further details on the license of quantities
+
diff --git a/quantities/dimensionality.py b/quantities/dimensionality.py
index 9dc7652..a6c00c1 100644
--- a/quantities/dimensionality.py
+++ b/quantities/dimensionality.py
@@ -11,6 +11,7 @@
 from . import markup
 from .registry import unit_registry
 from .decorators import memoize
+from collections import OrderedDict
 
 def assert_isinstance(obj, types):
     try:
@@ -21,7 +22,7 @@ def assert_isinstance(obj, types):
         )
 
 
-class Dimensionality(dict):
+class Dimensionality(OrderedDict):
 
     """
     """