diff --git a/build.sh b/build.sh
index f7b3cea..7075f46 100755
--- a/build.sh
+++ b/build.sh
@@ -50,7 +50,7 @@ command__tests() {
 }
 
 command__install_style() {
-    $PIP_INSTALL flake8
+    $PIP_INSTALL flake8 flake8-import-order
 }
 
 command__style() {
diff --git a/tests/storage/test_filesystem.py b/tests/storage/test_filesystem.py
index 5097307..6de3fe2 100644
--- a/tests/storage/test_filesystem.py
+++ b/tests/storage/test_filesystem.py
@@ -12,8 +12,8 @@ import os
 
 import pytest
 
-from vdirsyncer.utils.vobject import Item
 from vdirsyncer.storage.filesystem import FilesystemStorage
+from vdirsyncer.utils.vobject import Item
 
 from . import StorageTests
 
diff --git a/vdirsyncer/cli.py b/vdirsyncer/cli.py
index 9609cf0..22dea7b 100644
--- a/vdirsyncer/cli.py
+++ b/vdirsyncer/cli.py
@@ -13,7 +13,7 @@ import os
 import sys
 import threading
 
-from . import __version__, PROJECT_HOME, DOCS_HOME, log
+from . import DOCS_HOME, PROJECT_HOME, __version__, log
 from .doubleclick import click
 from .storage import storage_names
 from .sync import StorageEmpty, SyncConflict, sync
diff --git a/vdirsyncer/storage/dav.py b/vdirsyncer/storage/dav.py
index bcf4c2a..7ce521e 100644
--- a/vdirsyncer/storage/dav.py
+++ b/vdirsyncer/storage/dav.py
@@ -13,9 +13,9 @@ from lxml import etree
 
 from requests import session as requests_session
 
-from .. import exceptions, log, utils
 from .base import Item, Storage
 from .http import USERAGENT, prepare_auth, prepare_verify
+from .. import exceptions, log, utils
 
 
 dav_logger = log.get(__name__)
diff --git a/vdirsyncer/storage/filesystem.py b/vdirsyncer/storage/filesystem.py
index e29c44d..b21bdf9 100644
--- a/vdirsyncer/storage/filesystem.py
+++ b/vdirsyncer/storage/filesystem.py
@@ -9,8 +9,8 @@
 
 import os
 
-from .. import exceptions, log
 from .base import Item, Storage
+from .. import exceptions, log
 from ..utils import checkdir, expand_path, get_etag_from_file, safe_write
 from ..utils.compat import text_type
 
diff --git a/vdirsyncer/storage/singlefile.py b/vdirsyncer/storage/singlefile.py
index 41ab3dd..165db86 100644
--- a/vdirsyncer/storage/singlefile.py
+++ b/vdirsyncer/storage/singlefile.py
@@ -10,8 +10,8 @@
 import collections
 import os
 
-from .. import exceptions, log
 from .base import Item, Storage
+from .. import exceptions, log
 from ..utils import checkfile, expand_path, safe_write
 from ..utils.compat import iteritems, itervalues
 from ..utils.vobject import join_collection, split_collection
diff --git a/vdirsyncer/utils/__init__.py b/vdirsyncer/utils/__init__.py
index 556b2f6..9b1e123 100644
--- a/vdirsyncer/utils/__init__.py
+++ b/vdirsyncer/utils/__init__.py
@@ -13,9 +13,9 @@ import threading
 import requests
 from requests.packages.urllib3.poolmanager import PoolManager
 
+from .compat import iteritems, urlparse
 from .. import exceptions, log
 from ..doubleclick import click, ctx
-from .compat import iteritems, urlparse
 
 
 logger = log.get(__name__)