diff --git a/openmc/model/surface_composite.py b/openmc/model/surface_composite.py
index 70cdb33e1a..e1696edceb 100644
--- a/openmc/model/surface_composite.py
+++ b/openmc/model/surface_composite.py
@@ -58,10 +58,10 @@ class CylinderSector(CompositeSurface):
     This class acts as a proper surface, meaning that unary `+` and `-`
     operators applied to it will produce a half-space. The negative
     side is defined to be the region inside of the cylinder sector.
-     
+
     Parameters
     ----------
-    center : iterable of float   
+    center : iterable of float
        Coordinate for central axes of cylinders in the (y, z), (z, x), or
          (x, y) basis. Defaults to (0,0)
     r1 : float
@@ -136,8 +136,8 @@ class CylinderSector(CompositeSurface):
 
     def __pos__(self):
         return +self.outer_cyl | -self.inner_cyl | +self.plane0 | -self.plane1
-      
-      
+
+
 class IsogonalOctagon(CompositeSurface):
     """Infinite isogonal octagon composite surface
 
@@ -155,7 +155,6 @@ class IsogonalOctagon(CompositeSurface):
     Parameters
     ----------
     center : iterable of float
-
         Coordinate for the central axis of the octagon in the
         (y, z), (z, x), or (x, y) basis.
     r1 : float
diff --git a/tests/unit_tests/test_surface_composite.py b/tests/unit_tests/test_surface_composite.py
index f7dbeca4ef..6b9b6c7a53 100644
--- a/tests/unit_tests/test_surface_composite.py
+++ b/tests/unit_tests/test_surface_composite.py
@@ -171,7 +171,7 @@ def test_cylinder_sector(axis, indices):
     assert isinstance(s.inner_cyl, getattr(openmc, axis + "Cylinder"))
     assert isinstance(s.plane0, openmc.Plane)
     assert isinstance(s.plane1, openmc.Plane)
-    
+
     # Make sure boundary condition propagates
     s.boundary_type = 'reflective'
     assert s.boundary_type == 'reflective'
@@ -179,7 +179,7 @@ def test_cylinder_sector(axis, indices):
     assert s.inner_cyl.boundary_type == 'reflective'
     assert s.plane0.boundary_type == 'reflective'
     assert s.plane1.boundary_type == 'reflective'
-    
+
     # Check bounding box
     ll, ur = (+s).bounding_box
     assert np.all(np.isinf(ll))
@@ -237,7 +237,7 @@ def test_isogonal_octagon(axis, plane_tb, plane_lr, axis_idx):
     assert isinstance(s.lower_right, openmc.Plane)
     assert isinstance(s.upper_left, openmc.Plane)
     assert isinstance(s.lower_left, openmc.Plane)
-    
+
     # Make sure boundary condition propagates
     s.boundary_type = 'reflective'
     assert s.boundary_type == 'reflective'
@@ -285,4 +285,6 @@ def test_isogonal_octagon(axis, plane_tb, plane_lr, axis_idx):
         openmc.model.IsogonalOctagon(center, r1=10., r2=1.)
 
     # Make sure repr works
-    repr(s)
\ No newline at end of file
+    repr(s)
+
+