diff --git a/km3buu/geometry.py b/km3buu/geometry.py
index 712ddc6a575ffbd54c2edc55481fc168226426fc..27c685ec2d2bdbad50b47a787d644b43e2568d10 100644
--- a/km3buu/geometry.py
+++ b/km3buu/geometry.py
@@ -19,6 +19,7 @@ class DetectorVolume(ABC):
     """
     Detector geometry class
     """
+
     def __init__(self):
         self._volume = -1.0
         self._coord_origin = (0., 0., 0.)
@@ -96,6 +97,7 @@ class NoVolume(DetectorVolume):
     """
     Dummy volume to write out data w/o geometry 
     """
+
     def __init__(self):
         self._solid_angle = 1
         self._volume = 1
@@ -132,6 +134,7 @@ class CanVolume(DetectorVolume):
     zenith: float [1] (default: (-1.0, 1.0) )
         Zenith range given as cos(θ)
     """
+
     def __init__(self,
                  radius=403.4,
                  zmin=0.0,
@@ -189,6 +192,7 @@ class SphericalVolume(DetectorVolume):
     zenith: float [1] (default: (-1.0, 1.0) )
         Zenith range given as cos(θ)
     """
+
     def __init__(self, radius, coord_origin=(0, 0, 0), zenith=(-1, 1)):
         super().__init__()
         self._radius = radius
diff --git a/km3buu/tests/test_geometry.py b/km3buu/tests/test_geometry.py
index ee4c209d9a9d0f7ab194d1e9c26666bb0cd5d5a9..f41e6b134c1611b89bdb246b88f8d53671be098d 100644
--- a/km3buu/tests/test_geometry.py
+++ b/km3buu/tests/test_geometry.py
@@ -17,12 +17,14 @@ import numpy as np
 
 
 class TestGeneralGeometry(unittest.TestCase):
+
     def test_abstract_init(self):
         with self.assertRaises(TypeError) as ctx:
             d = DetectorVolume()
 
 
 class TestSphere(unittest.TestCase):
+
     def setUp(self):
         self.detector_geometry = SphericalVolume(20, (2, 2, 2))
 
@@ -57,6 +59,7 @@ class TestSphere(unittest.TestCase):
 
 
 class TestCan(unittest.TestCase):
+
     def setUp(self):
         self.detector_geometry = CanVolume()