diff --git a/tests/test_logbook.py b/tests/test_logbook.py
index 3ecc91f..cc3c11f 100644
--- a/tests/test_logbook.py
+++ b/tests/test_logbook.py
@@ -55,7 +55,7 @@ class TestLogbook(unittest.TestCase):
     @mock.patch('pyqso.auxiliary_dialogs.handle_gtk_dialog')
     def test_open_invalid_logbook(self, mock_handle_gtk_dialog):
         """ Open an invalid database file (comprising only one line of plain text) and check that an error occurs. """
-        path_to_invalid_database = os.path.join(os.path.realpath(os.path.dirname(__file__)), os.pardir, "res/invalid.db") 
+        path_to_invalid_database = os.path.join(os.path.realpath(os.path.dirname(__file__)), os.pardir, "res/invalid.db")
         opened = self.logbook.open(path=path_to_invalid_database, render=False)
         assert(not opened)
         assert(self.logbook.logs is None)