diff --git a/firedrake/assemble.py b/firedrake/assemble.py
index 316963c157..3465b3160f 100644
--- a/firedrake/assemble.py
+++ b/firedrake/assemble.py
@@ -109,7 +109,6 @@ def assemble(expr, *args, **kwargs):
     else:
         raise TypeError(f"Unable to assemble: {expr}")
 
-
 @PETSc.Log.EventDecorator()
 def allocate_matrix(expr, bcs=None, *, mat_type=None, sub_mat_type=None,
                     appctx=None, form_compiler_parameters=None, options_prefix=None):