diff --git a/wagtail/contrib/postgres_search/backend.py b/wagtail/contrib/postgres_search/backend.py
index d41b6b0eb..e66eea1a2 100644
--- a/wagtail/contrib/postgres_search/backend.py
+++ b/wagtail/contrib/postgres_search/backend.py
@@ -249,8 +249,8 @@ class PostgresSearchQueryCompiler(BaseSearchQueryCompiler):
         return queryset[start:stop]
 
     def _process_lookup(self, field, lookup, value):
-        return Q(**{field.get_attname(self.queryset.model)
-                    + '__' + lookup: value})
+        return Q(**{field.get_attname(self.queryset.model) +
+                    '__' + lookup: value})
 
     def _connect_filters(self, filters, connector, negated):
         if connector == 'AND':
diff --git a/wagtail/contrib/postgres_search/tests/test_backend.py b/wagtail/contrib/postgres_search/tests/test_backend.py
index dbeead789..96ceea996 100644
--- a/wagtail/contrib/postgres_search/tests/test_backend.py
+++ b/wagtail/contrib/postgres_search/tests/test_backend.py
@@ -1,6 +1,3 @@
-# coding: utf-8
-import unittest
-
 from django.test import TestCase
 
 from wagtail.search.tests.test_backends import QueryAPITestMixin, BackendTests