diff --git a/setup.py b/setup.py
index fc3586c..406d5c1 100644
--- a/setup.py
+++ b/setup.py
@@ -7,5 +7,6 @@
     install_requires=[
         "numpy",
         "scipy",
+        "h5py"
     ],
 )
diff --git a/src/qib/backend/tensor_network_provider.py b/src/qib/backend/tensor_network_provider.py
index 13aa537..51cd5cc 100644
--- a/src/qib/backend/tensor_network_provider.py
+++ b/src/qib/backend/tensor_network_provider.py
@@ -1,5 +1,5 @@
-import h5py
 from typing import Sequence
+import h5py
 from qib.backend import QuantumProvider
 from qib.circuit import Circuit
 from qib.field import Field
@@ -28,4 +28,3 @@ def query_results(self, job):
         """
         Query results of a previously submitted job.
         """
-        pass