diff --git a/hnn_core/hnn_io.py b/hnn_core/hnn_io.py
index 1c07beb449..14a7f86924 100644
--- a/hnn_core/hnn_io.py
+++ b/hnn_core/hnn_io.py
@@ -8,7 +8,6 @@
 import json
 import numpy as np
 
-from h5io import read_hdf5
 from collections import OrderedDict
 
 from .cell import Cell, Section
@@ -453,4 +452,3 @@ def read_network_configuration(fname, read_drives=True):
     net.delay = net_data['delay']
 
     return net
-
diff --git a/hnn_core/tests/test_io.py b/hnn_core/tests/test_io.py
index 0f8c625728..7de2ed84c3 100644
--- a/hnn_core/tests/test_io.py
+++ b/hnn_core/tests/test_io.py
@@ -12,7 +12,8 @@
 
 from hnn_core.hnn_io import (_cell_response_to_dict, _rec_array_to_dict,
                              _external_drive_to_dict, _str_to_node,
-                             _conn_to_dict, _order_drives, read_network_configuration
+                             _conn_to_dict, _order_drives,
+                             read_network_configuration
                              )
 
 hnn_core_root = Path(__file__).parents[1]
@@ -90,7 +91,8 @@ def generate_test_files(jones_2009_network):
     net = jones_2009_network
     net.write_configuration(Path('.', 'assets/jones2009_3x3_drives.json'))
     simulate_dipole(net, tstop=2, n_trials=1, dt=0.5)
-    net.write_configuration(Path('.', 'assets/jones2009_3x3_drives_simulated.json'))
+    net.write_configuration(Path('.',
+                                 'assets/jones2009_3x3_drives_simulated.json'))
 
 
 def test_eq(jones_2009_network, calcium_network):
@@ -308,7 +310,9 @@ def test_order_drives(jones_2009_network):
 
 def test_read_configuration_json(jones_2009_network):
     """ Read-in of a hdf5 file """
-    net = read_network_configuration(Path(assets_path, 'jones2009_3x3_drives.json'))
+    net = read_network_configuration(Path(assets_path,
+                                          'jones2009_3x3_drives.json')
+                                     )
     assert net == jones_2009_network