diff --git a/.travis.yml b/.travis.yml
index 27c53113..ce6f446a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -74,6 +74,7 @@ before_script:
 
 script:
 - pytest --forked
+- if [ $TRAVIS_OS_NAME = "linux" ]; then tox -e flake8; fi
 
 #after_script:
 #- |
diff --git a/setup.cfg b/setup.cfg
index 3e4f99c5..2950acbc 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -63,7 +63,7 @@ filterwarnings =
 source = src
 
 [flake8]
-ignore = W503
+ignore =
 max-line-length = 120
 exclude = build,dist,.git,.idea,.cache,.tox,.eggs
 
diff --git a/src/vorta/borg/borg_thread.py b/src/vorta/borg/borg_thread.py
index ad62f83d..d8b8bac4 100644
--- a/src/vorta/borg/borg_thread.py
+++ b/src/vorta/borg/borg_thread.py
@@ -18,7 +18,7 @@
 class BorgThread(QtCore.QThread, BackupProfileMixin):
     """
     Base class to run `borg` command line jobs. If a command needs more pre- or post-processing
-    it should sublass `BorgThread`.
+    it should subclass `BorgThread`.
     """
 
     updated = QtCore.pyqtSignal(str)
@@ -42,12 +42,14 @@ def __init__(self, cmd, params, parent=None):
 
         env = os.environ.copy()
         env['BORG_HOSTNAME_IS_UNIQUE'] = '1'
-        if params.get('password') and params['password'] is not None:
-            env['BORG_PASSPHRASE'] = params['password']
+        password = params.get('password')
+        if password is not None:
+            env['BORG_PASSPHRASE'] = password
 
         env['BORG_RSH'] = 'ssh -oStrictHostKeyChecking=no'
-        if params.get('ssh_key') and params['ssh_key'] is not None:
-            env['BORG_RSH'] += f' -i ~/.ssh/{params["ssh_key"]}'
+        ssh_key = params.get('ssh_key')
+        if ssh_key is not None:
+            env['BORG_RSH'] += f' -i ~/.ssh/{ssh_key}'
 
         self.env = env
         self.cmd = cmd
diff --git a/src/vorta/borg/create.py b/src/vorta/borg/create.py
index 30c4c5a2..0c42d9c3 100644
--- a/src/vorta/borg/create.py
+++ b/src/vorta/borg/create.py
@@ -63,9 +63,13 @@ def prepare(cls, profile):
         current_wifi = get_current_wifi()
         if current_wifi is not None:
             wifi_is_disallowed = WifiSettingModel.select().where(
-                (WifiSettingModel.ssid == current_wifi)
-                & (WifiSettingModel.allowed is False)
-                & (WifiSettingModel.profile == profile.id)
+                (
+                    WifiSettingModel.ssid == current_wifi
+                ) & (
+                    WifiSettingModel.allowed is False
+                ) & (
+                    WifiSettingModel.profile == profile.id
+                )
             )
             if wifi_is_disallowed.count() > 0 and profile.repo.is_remote_repo():
                 ret['message'] = 'Current Wifi is not allowed.'
diff --git a/src/vorta/scheduler.py b/src/vorta/scheduler.py
index 6d7cb6a9..7bfdbfe5 100644
--- a/src/vorta/scheduler.py
+++ b/src/vorta/scheduler.py
@@ -113,9 +113,13 @@ def post_backup_tasks(self, profile_id):
 
         validation_cutoff = date.today() - timedelta(days=7 * profile.validation_weeks)
         recent_validations = EventLogModel.select().where(
-            (EventLogModel.subcommand == 'check')
-            & (EventLogModel.start_time > validation_cutoff)
-            & (EventLogModel.repo_url == profile.repo.url)
+            (
+                EventLogModel.subcommand == 'check'
+            ) & (
+                EventLogModel.start_time > validation_cutoff
+            ) & (
+                EventLogModel.repo_url == profile.repo.url
+            )
         ).count()
         if profile.validation_on and recent_validations == 0:
             msg = BorgCheckThread.prepare(profile)
diff --git a/src/vorta/updater.py b/src/vorta/updater.py
index d219a5ce..bc81b92f 100644
--- a/src/vorta/updater.py
+++ b/src/vorta/updater.py
@@ -4,11 +4,8 @@
 
 def get_updater():
     if sys.platform == 'darwin' and getattr(sys, 'frozen', False):
-        """
-        Use sparkle framework on macOS.
-
-        Examples: https://programtalk.com/python-examples/objc.loadBundle/
-        """
+        # Use sparkle framework on macOS.
+        # Examples: https://programtalk.com/python-examples/objc.loadBundle/
         from objc import loadBundle
         bundle_path = os.path.join(os.path.dirname(sys.executable), os.pardir, 'Frameworks', 'Sparkle.framework')
         loadBundle('Sparkle', globals(), bundle_path)
diff --git a/src/vorta/utils.py b/src/vorta/utils.py
index 0a96d59b..a6f1335e 100644
--- a/src/vorta/utils.py
+++ b/src/vorta/utils.py
@@ -39,7 +39,7 @@ def delete_password(self, service, repo_url):
         pass
 
 
-"""Select keyring/Workaround for pyinstaller+keyring issue."""
+# Select keyring/Workaround for pyinstaller+keyring issue.
 if sys.platform == 'darwin':
     from keyring.backends import OS_X
     keyring.set_keyring(OS_X.Keyring())
diff --git a/src/vorta/views/archive_tab.py b/src/vorta/views/archive_tab.py
index d78bcaab..3eba2980 100644
--- a/src/vorta/views/archive_tab.py
+++ b/src/vorta/views/archive_tab.py
@@ -1,9 +1,7 @@
 import sys
 from datetime import timedelta
 from PyQt5 import uic, QtCore
-from PyQt5.QtCore import QSize
-from PyQt5.QtGui import QIcon
-from PyQt5.QtWidgets import QTableWidgetItem, QTableView, QHeaderView, QComboBox, QToolButton, QButtonGroup, QToolBar
+from PyQt5.QtWidgets import QTableWidgetItem, QTableView, QHeaderView
 
 from vorta.borg.prune import BorgPruneThread
 from vorta.borg.list import BorgListThread
diff --git a/src/vorta/views/collection_rc.py b/src/vorta/views/collection_rc.py
index 040b301b..0e1dd6ef 100644
--- a/src/vorta/views/collection_rc.py
+++ b/src/vorta/views/collection_rc.py
@@ -949,10 +949,13 @@
     rcc_version = 2
     qt_resource_struct = qt_resource_struct_v2
 
+
 def qInitResources():
     QtCore.qRegisterResourceData(rcc_version, qt_resource_struct, qt_resource_name, qt_resource_data)
 
+
 def qCleanupResources():
     QtCore.qUnregisterResourceData(rcc_version, qt_resource_struct, qt_resource_name, qt_resource_data)
 
+
 qInitResources()
diff --git a/src/vorta/views/extract_dialog.py b/src/vorta/views/extract_dialog.py
index a1e69701..0a3da461 100644
--- a/src/vorta/views/extract_dialog.py
+++ b/src/vorta/views/extract_dialog.py
@@ -1,11 +1,6 @@
-import os
 from PyQt5 import uic
 from PyQt5.QtCore import Qt
-from PyQt5.QtWidgets import QApplication, QTreeWidgetItem, QHeaderView
-
-from paramiko.rsakey import RSAKey
-from paramiko.ecdsakey import ECDSAKey
-from paramiko.ed25519key import Ed25519Key
+from PyQt5.QtWidgets import QTreeWidgetItem, QHeaderView
 
 from ..utils import get_asset
 
@@ -13,6 +8,7 @@
 ExtractDialogUI, ExtractDialogBase = uic.loadUiType(uifile)
 n = 0
 
+
 class ExtractDialog(ExtractDialogBase, ExtractDialogUI):
     def __init__(self):
         super().__init__()
@@ -30,7 +26,7 @@ def __init__(self):
                                 'another key2': ['value2', 'value', 'value4']}
             for j in range(50):
                 d[f'folder-{i}'][f'large folder {j}'] = {'another key1': 'another value1',
-                                                        'another key2': ['value2', 'value', 'value4']}
+                                                         'another key2': ['value2', 'value', 'value4']}
 
         # add top-level folders to test scroll performance
         for f in range(1000000):
@@ -55,6 +51,7 @@ def build_tree(self):
         fill_item(self.fileTree.invisibleRootItem(), self.d)
         print('Added test items', n)
 
+
 def fill_item(item, value):
     global n
     # item.setExpanded(True)
@@ -67,7 +64,7 @@ def fill_item(item, value):
             child.setFlags(child.flags() | Qt.ItemIsUserCheckable)
             child.setCheckState(0, Qt.Unchecked)
             item.addChild(child)
-            n+=1
+            n += 1
             fill_item(child, val)
     elif type(value) is list:
         for val in value:
@@ -75,7 +72,7 @@ def fill_item(item, value):
             child.setFlags(child.flags() | Qt.ItemIsUserCheckable)
             child.setCheckState(0, Qt.Unchecked)
             item.addChild(child)
-            n+=1
+            n += 1
             if type(val) is dict:
                 child.setText(0, '[dict]')
                 fill_item(child, val)
@@ -90,5 +87,4 @@ def fill_item(item, value):
         child.setFlags(child.flags() | Qt.ItemIsUserCheckable)
         child.setCheckState(0, Qt.Unchecked)
         item.addChild(child)
-        n+=1
-
+        n += 1
diff --git a/src/vorta/views/main_window.py b/src/vorta/views/main_window.py
index d08c4cb2..aca80852 100644
--- a/src/vorta/views/main_window.py
+++ b/src/vorta/views/main_window.py
@@ -110,8 +110,8 @@ def profile_delete_action(self):
             self.profile_select_action(1)
 
     def backup_started_event(self):
-            self.set_status(progress_max=0)
-            self._toggle_buttons(create_enabled=False)
+        self.set_status(progress_max=0)
+        self._toggle_buttons(create_enabled=False)
 
     def backup_finished_event(self):
         self.set_status(progress_max=100)