diff --git a/ufl/geometry.py b/ufl/geometry.py
index 20dc209fc..56505100e 100644
--- a/ufl/geometry.py
+++ b/ufl/geometry.py
@@ -999,12 +999,14 @@ class ReferenceFacetVolume(GeometricFacetQuantity):
     __slots__ = ()
     name = "reference_facet_volume"
 
+
 @ufl_type()
 class ReferenceEdgeVolume(GeometricEdgeQuantity):
     """UFL geometry representation: The volume of the reference cell of the current edge."""
     __slots__ = ()
     name = "reference_edge_volume"
 
+
 @ufl_type()
 class CellVolume(GeometricCellQuantity):
     """UFL geometry representation: The volume of the cell."""