--- a/toolkit/components/telemetry/histogram_tools.py
+++ b/toolkit/components/telemetry/histogram_tools.py
@@ -1,20 +1,16 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 from __future__ import with_statement
 
 import math
-import json
-try:
-    from collections import OrderedDict
-except ImportError:
-    from simplejson import OrderedDict
+import simplejson as json
 
 def table_dispatch(kind, table, body):
     """Call body with table[kind] if it exists.  Raise an error otherwise."""
     if kind in table:
         return body(table[kind])
     else:
         raise BaseException, "don't know how to handle a histogram of kind %s" % kind
 
@@ -197,11 +193,11 @@ associated with the histogram.  Returns 
                 definition['high'],
                 definition['n_buckets'])
 
 def from_file(filename):
     """Return an iterator that provides a sequence of Histograms for
 the histograms defined in filename.
     """
     with open(filename, 'r') as f:
-        histograms = json.load(f, object_pairs_hook=OrderedDict)
+        histograms = json.load(f, object_pairs_hook=json.OrderedDict)
         for (name, definition) in histograms.iteritems():
             yield Histogram(name, definition)