diff --git a/CHANGES.txt b/CHANGES.txt
index fdd1070..28a42c2 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,6 +1,9 @@
 Changelog
 =========
 
+1.7.3 (2016-08-22)
+ Bugfix: initialize value of reduce in getRecordTypes
+
 1.7.2 (2015-12-21)
  Upgraded xmltramp to 2.18 with some inline patching.
  Experimenting with Travis-CI integration.
diff --git a/setup.py b/setup.py
index bf91885..c28a140 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 from setuptools import setup
 
 setup(name='pyforce',
-    version='1.7.2', # be sure to update the version in pyforce.py too
+    version='1.7.3', # be sure to update the version in pyforce.py too
     package_dir={'': 'src'},
     packages=['pyforce'],
     author = "Simon Fell et al.  reluctantly Forked by idbentley",
diff --git a/src/pyforce/pyforce.py b/src/pyforce/pyforce.py
index a444bb9..3836306 100644
--- a/src/pyforce/pyforce.py
+++ b/src/pyforce/pyforce.py
@@ -721,5 +721,5 @@ def getRecordTypes(xml):
             elif isQueryResult(field):
                 record_types.update(reduce(lambda x, y: x | y, [
                                     getRecordTypes(r) for r in
-                                    field[_tPartnerNS.records,]]))
+                                    field[_tPartnerNS.records,]], set()))
     return record_types