diff --git a/doc/source/tutorials/copper/tuto_ped_copper.rst b/doc/source/tutorials/copper/tuto_ped_copper.rst
index 0c564f3..ee2ac69 100644
--- a/doc/source/tutorials/copper/tuto_ped_copper.rst
+++ b/doc/source/tutorials/copper/tuto_ped_copper.rst
@@ -49,7 +49,7 @@ This is the job of the *ase* module, so load the module
 
 	# Create the copper cubic cell
 	copper = bulk('Cu', a=a0, cubic=True)
-        view(cluster)
+        view(copper)
 
 In line 6 we load the :py:func:`bulk` function to create our atomic object and,
 in line 7, we load the :py:func:`view` function to actually view our cluster.