diff --git a/firedrake/function.py b/firedrake/function.py
index 585a1511d1..da4d264971 100644
--- a/firedrake/function.py
+++ b/firedrake/function.py
@@ -125,7 +125,7 @@ def split(self):
     @utils.cached_property
     def _components(self):
         if self.function_space().rank == 0:
-            return tuple((self, ))
+            return (self, )
         else:
             if self.dof_dset.cdim == 1:
                 return (CoordinatelessFunction(self.function_space().sub(0), val=self.dat,
@@ -335,7 +335,7 @@ def split(self):
     @utils.cached_property
     def _components(self):
         if self.function_space().rank == 0:
-            return tuple((self, ))
+            return (self, )
         else:
             return tuple(type(self)(self.function_space().sub(i), self.topological.sub(i))
                          for i in range(self.function_space().block_size))