diff --git a/qutebrowser/completion/models/sqlcategory.py b/qutebrowser/completion/models/sqlcategory.py
index 543ea2ade..5b8cf4482 100644
--- a/qutebrowser/completion/models/sqlcategory.py
+++ b/qutebrowser/completion/models/sqlcategory.py
@@ -60,10 +60,10 @@ class SqlCategory(QSqlQueryModel):
             querystr += ' order by {} {}'.format(sort_by, sort_order)
 
         self._query = sql.Query(querystr)
-        self._param_count=len(filter_fields)
+        self._param_count = len(filter_fields)
         self.set_pattern('', [0])
 
-    def set_pattern(self, pattern, columns_to_filter):
+    def set_pattern(self, pattern, _columns_to_filter):
         """Set the pattern used to filter results.
 
         Args:
diff --git a/qutebrowser/misc/sql.py b/qutebrowser/misc/sql.py
index 5acc620fb..0b81fc0f9 100644
--- a/qutebrowser/misc/sql.py
+++ b/qutebrowser/misc/sql.py
@@ -19,13 +19,13 @@
 
 """Provides access to an in-memory sqlite database."""
 
+import collections
+
 from PyQt5.QtCore import QObject, pyqtSignal
 from PyQt5.QtSql import QSqlDatabase, QSqlQuery
 
 from qutebrowser.utils import log
 
-import collections
-
 
 class SqlException(Exception):
 
diff --git a/tests/unit/completion/test_completionmodel.py b/tests/unit/completion/test_completionmodel.py
index 05af902a3..d3cd23f68 100644
--- a/tests/unit/completion/test_completionmodel.py
+++ b/tests/unit/completion/test_completionmodel.py
@@ -19,8 +19,8 @@
 
 """Tests for CompletionModel."""
 
-import hypothesis
 from unittest import mock
+import hypothesis
 from hypothesis import strategies
 
 from qutebrowser.completion.models import completionmodel
diff --git a/tests/unit/completion/test_models.py b/tests/unit/completion/test_models.py
index 8666ecc5b..c46287926 100644
--- a/tests/unit/completion/test_models.py
+++ b/tests/unit/completion/test_models.py
@@ -26,7 +26,6 @@ import pytest
 from PyQt5.QtCore import QUrl
 from PyQt5.QtWidgets import QTreeView
 
-from qutebrowser.browser import history
 from qutebrowser.completion.models import miscmodels, urlmodel, configmodel
 from qutebrowser.config import sections, value
 from qutebrowser.misc import sql
diff --git a/tests/unit/utils/test_version.py b/tests/unit/utils/test_version.py
index c0c731f88..11bf326fb 100644
--- a/tests/unit/utils/test_version.py
+++ b/tests/unit/utils/test_version.py
@@ -798,6 +798,7 @@ def test_chromium_version_unpatched(qapp):
     assert version._chromium_version() not in ['', 'unknown', 'unavailable']
 
 
+# pylint: disable=too-many-locals
 @pytest.mark.parametrize(['git_commit', 'frozen', 'style', 'with_webkit',
                           'known_distribution'], [
     (True, False, True, True, True),  # normal