diff --git a/patroni/api.py b/patroni/api.py
index 7000fc2f..b87711b2 100644
--- a/patroni/api.py
+++ b/patroni/api.py
@@ -4,7 +4,7 @@ import json
 import logging
 import psycopg2
 import time
-import dateutil
+import dateutil.parser
 import datetime
 import pytz
 
diff --git a/patroni/ctl.py b/patroni/ctl.py
index 26fef782..a0f0c565 100644
--- a/patroni/ctl.py
+++ b/patroni/ctl.py
@@ -5,7 +5,7 @@ Patroni Control
 import base64
 import click
 import datetime
-import dateutil
+import dateutil.parser
 import json
 import logging
 import os
diff --git a/patroni/scripts/wale_restore.py b/patroni/scripts/wale_restore.py
index f3691907..4383e986 100755
--- a/patroni/scripts/wale_restore.py
+++ b/patroni/scripts/wale_restore.py
@@ -33,7 +33,7 @@ import sys
 import argparse
 
 
-if sys.hexversion >= 0x03000000:
+if sys.hexversion >= 0x0300000:
     long = int
 
 logger = logging.getLogger(__name__)
diff --git a/patroni/utils.py b/patroni/utils.py
index a200292e..9c7a9e9d 100644
--- a/patroni/utils.py
+++ b/patroni/utils.py
@@ -1,36 +1,17 @@
-import datetime
 import os
 import random
-import six
+import sys
 import time
-import pytz
-import dateutil.parser
 
 from patroni.exceptions import PatroniException
 
+if sys.hexversion >= 0x0300000:
+    long = int
+
 __interrupted_sleep = False
 __reap_children = False
 
 
-def calculate_ttl(expiration):
-    """
-    >>> calculate_ttl(None)
-    >>> calculate_ttl('2015-06-10 12:56:30.552539016Z') < 0
-    True
-    >>> calculate_ttl('2015-06-10T12:56:30.552539016Z') < 0
-    True
-    >>> calculate_ttl('fail-06-10T12:56:30.552539016Z')
-    """
-    if not expiration:
-        return None
-    try:
-        expiration = dateutil.parser.parse(expiration)
-    except (ValueError, TypeError):
-        return None
-    now = datetime.datetime.now(pytz.utc)
-    return int((expiration - now).total_seconds())
-
-
 def deep_compare(obj1, obj2):
     """
     >>> deep_compare({'1': None}, {})
@@ -134,7 +115,7 @@ def strtol(value, strict=True):
         while i < l:
             try:  # try to find maximally long number
                 i += 1  # by giving to `int` longer and longer strings
-                ret = int(value[:i], base) if six.PY3 else long(value[:i], base)
+                ret = long(value[:i], base)
             except ValueError:  # until we will not get an exception or end of the string
                 i -= 1
                 break
diff --git a/setup.py b/setup.py
index 6af7b953..d285bbd4 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@ LICENSE = 'The MIT License'
 URL = 'https://github.com/zalando/patroni'
 AUTHOR = 'Alexander Kukushkin, Oleksii Kliukin, Feike Steenbergen'
 AUTHOR_EMAIL = 'alexander.kukushkin@zalando.de, oleksii.kliukin@zalando.de, feike.steenbergen@zalando.de'
-KEYWORDS = 'etcd governor patroni postgresql postgres ha zookeeper streaming replication'
+KEYWORDS = 'etcd governor patroni postgresql postgres ha haproxy confd zookeeper exhibitor consul streaming replication'
 
 COVERAGE_XML = True
 COVERAGE_HTML = False
diff --git a/tests/test_postgresql.py b/tests/test_postgresql.py
index ec0151a2..42dcab0a 100644
--- a/tests/test_postgresql.py
+++ b/tests/test_postgresql.py
@@ -336,7 +336,9 @@ class TestPostgresql(unittest.TestCase):
 
     @patch('os.path.isfile', Mock(return_value=True))
     @patch('os.kill', Mock(side_effect=Exception))
-    @patch.object(builtins, 'open', mock_open(read_data='-999999999999999'))
+    @patch('os.getpid', Mock(return_value=2))
+    @patch('os.getppid', Mock(return_value=2))
+    @patch.object(builtins, 'open', mock_open(read_data='-1'))
     @patch.object(Postgresql, '_version_file_exists', Mock(return_value=True))
     def test_is_running(self):
         self.assertFalse(self.p.is_running())