diff --git a/src/qibo/models/encodings.py b/src/qibo/models/encodings.py
index 9b9fa620b..5b1bf71bd 100644
--- a/src/qibo/models/encodings.py
+++ b/src/qibo/models/encodings.py
@@ -120,7 +120,7 @@ def binary_encoder(data, **kwargs):
     """Create circuit that encodes ``data`` in all amplitudes of the computational basis.
 
     Data has to be normalized with respect to the Hilbert-Schmidt norm.
-    
+
     Args:
         data (ndarray or list): :math:`1`-dimensional array or length :math:`2^{n}`
             to be loaded in the amplitudes of a :math:`n`-qubit quantum state.
@@ -165,7 +165,9 @@ def binary_encoder(data, **kwargs):
         gate_list = []
         if len(anticontrols) > 0:
             gate_list.append(gates.X(qubit) for qubit in anticontrols)
-        gate_list.append(gates.RY(targets[0], 0.0).controlled_by(*(controls + anticontrols)))
+        gate_list.append(
+            gates.RY(targets[0], 0.0).controlled_by(*(controls + anticontrols))
+        )
         if len(anticontrols) > 0:
             gate_list.append(gates.X(qubit) for qubit in anticontrols)
         circuit.add(gate_list)
@@ -176,7 +178,6 @@ def binary_encoder(data, **kwargs):
     return circuit
 
 
-
 def unary_encoder(data, architecture: str = "tree", **kwargs):
     """Create circuit that performs the (deterministic) unary encoding of ``data``.
 
diff --git a/tests/test_models_encodings.py b/tests/test_models_encodings.py
index 5ac965350..f781c0048 100644
--- a/tests/test_models_encodings.py
+++ b/tests/test_models_encodings.py
@@ -113,6 +113,7 @@ def test_binary_encoder(backend, nqubits):
     state = backend.execute_circuit(circuit).state()
     backend.assert_allclose(state, target)
 
+
 @pytest.mark.parametrize("kind", [None, list])
 @pytest.mark.parametrize("architecture", ["tree", "diagonal"])
 @pytest.mark.parametrize("nqubits", [8])