diff --git a/tests/utils/test_vobject.py b/tests/utils/test_vobject.py
index 1b438cb..265332e 100644
--- a/tests/utils/test_vobject.py
+++ b/tests/utils/test_vobject.py
@@ -2,8 +2,6 @@
 
 from textwrap import dedent
 
-import pytest
-
 import vdirsyncer.utils.vobject as vobject
 
 from .. import BARE_EVENT_TEMPLATE, EVENT_TEMPLATE, VCARD_TEMPLATE, \
diff --git a/vdirsyncer/utils/vobject.py b/vdirsyncer/utils/vobject.py
index cfa6734..47687f2 100644
--- a/vdirsyncer/utils/vobject.py
+++ b/vdirsyncer/utils/vobject.py
@@ -3,7 +3,7 @@
 import hashlib
 from itertools import chain, tee
 
-from . import cached_property, split_sequence, uniq
+from . import cached_property, uniq
 from .compat import text_type
 
 
@@ -104,6 +104,7 @@ def split_collection(text):
     assert isinstance(text, text_type)
     inline = []
     items = []
+
     def inner(item, main):
         if item.name == u'VTIMEZONE':
             inline.append(item)
@@ -134,6 +135,7 @@ _default_join_wrappers = {
     u'VCARD': u'VADDRESSBOOK'
 }
 
+
 def join_collection(items, wrappers=_default_join_wrappers):
     '''
     :param wrappers: {