diff --git a/setup.py b/setup.py
index bb36a8ef5..0a03ecc40 100644
--- a/setup.py
+++ b/setup.py
@@ -20,11 +20,14 @@ def get_extensions():
                            ['scilpy/tractograms/uncompress.pyx'])
     quick_tools = Extension('scilpy.tractanalysis.quick_tools',
                             ['scilpy/tractanalysis/quick_tools.pyx'])
-    voxel_boundary_intersection = Extension('scilpy.tractanalysis.voxel_boundary_intersection',
-                                            ['scilpy/tractanalysis/voxel_boundary_intersection.pyx'])
-    streamlines_metrics = Extension('scilpy.tractanalysis.streamlines_metrics',
-                                    ['scilpy/tractanalysis/streamlines_metrics.pyx'])
-    return [uncompress, quick_tools, voxel_boundary_intersection, streamlines_metrics]
+    voxel_boundary_intersection =\
+        Extension('scilpy.tractanalysis.voxel_boundary_intersection',
+                  ['scilpy/tractanalysis/voxel_boundary_intersection.pyx'])
+    streamlines_metrics =\
+        Extension('scilpy.tractanalysis.streamlines_metrics',
+                  ['scilpy/tractanalysis/streamlines_metrics.pyx'])
+    return [uncompress, quick_tools,
+            voxel_boundary_intersection, streamlines_metrics]
 
 
 class CustomBuildExtCommand(build_ext):