diff --git a/src/qibojit/backends/gpu.py b/src/qibojit/backends/gpu.py
index 3cd3676..e03b6e0 100644
--- a/src/qibojit/backends/gpu.py
+++ b/src/qibojit/backends/gpu.py
@@ -1,7 +1,6 @@
 from typing import Union
 
 import numpy as np
-
 from qibo.backends.numpy import NumpyBackend
 from qibo.config import log, raise_error