diff --git a/doc/source/whatsnew/v0.22.0.txt b/doc/source/whatsnew/v0.22.0.txt
index 5c64b0a55c09b..459cf40e9e7d5 100644
--- a/doc/source/whatsnew/v0.22.0.txt
+++ b/doc/source/whatsnew/v0.22.0.txt
@@ -89,6 +89,7 @@ Bug Fixes
 
 - Bug in ``pd.read_msgpack()`` with a non existent file is passed in Python 2 (:issue:`15296`)
 - Bug in ``DataFrame.groupby`` where key as tuple in a ``MultiIndex`` were interpreted as a list of keys (:issue:`17979`)
+- .timestamp() unittests fail on python3 (:issue:`18037`)
 
 Conversion
 ^^^^^^^^^^
diff --git a/pandas/tests/scalar/test_timestamp.py b/pandas/tests/scalar/test_timestamp.py
index 4cd9a2fadeb32..bb046348be53c 100644
--- a/pandas/tests/scalar/test_timestamp.py
+++ b/pandas/tests/scalar/test_timestamp.py
@@ -1106,8 +1106,8 @@ def test_timestamp(self):
 
         if PY3:
             # should agree with datetime.timestamp method
-            dt = ts.to_pydatetime()
-            assert dt.timestamp() == ts.timestamp()
+            dt = uts.to_pydatetime()
+            assert dt.timestamp() == uts.timestamp()
 
 
 class TestTimestampNsOperations(object):
diff --git a/pandas/tests/tseries/test_timezones.py b/pandas/tests/tseries/test_timezones.py
index ddcf1bb7d8b7b..e755d9b654eb9 100644
--- a/pandas/tests/tseries/test_timezones.py
+++ b/pandas/tests/tseries/test_timezones.py
@@ -1283,8 +1283,10 @@ def test_replace_tzinfo(self):
         assert result_dt == result_pd
         assert result_dt == result_pd.to_pydatetime()
 
-        result_dt = dt.replace(tzinfo=tzinfo).replace(tzinfo=None)
-        result_pd = Timestamp(dt).replace(tzinfo=tzinfo).replace(tzinfo=None)
+        result_dt = (dt.replace(tzinfo=tzinfo)
+                     .replace(tzinfo=pytz.timezone('UTC')))
+        result_pd = (Timestamp(dt).replace(tzinfo=tzinfo)
+                     .replace(tzinfo=pytz.timezone('UTC')))
 
         if hasattr(result_dt, 'timestamp'):  # New method in Py 3.3
             assert result_dt.timestamp() == result_pd.timestamp()