diff --git a/sphinx/versioning.py b/sphinx/versioning.py
index 9ba7e3f78..5806e971b 100644
--- a/sphinx/versioning.py
+++ b/sphinx/versioning.py
@@ -67,8 +67,8 @@ def merge_doctrees(old, new, condition):
             continue
         if not merge_node(old_node, new_node):
             if old_nodes:
-                for i, old_node in enumerate(old_nodes):
-                    if merge_node(old_node, new_node):
+                for i, very_old_node in enumerate(old_nodes):
+                    if merge_node(very_old_node, new_node):
                         del old_nodes[i]
                         # If the last identified node which has not matched the
                         # unidentified node matches the current one, we have to
diff --git a/tests/test_versioning.py b/tests/test_versioning.py
index 19ef89040..47c322bb6 100644
--- a/tests/test_versioning.py
+++ b/tests/test_versioning.py
@@ -78,8 +78,6 @@ def test_deleted_end():
     assert original_uids[:-1] == uids
 
 def test_insert():
-    from nose import SkipTest
-    raise SkipTest('The algorithm does not work at the moment')
     insert = doctrees['versioning/insert']
     new_nodes = list(merge_doctrees(original, insert, is_paragraph))
     uids = [n.uid for n in insert.traverse(is_paragraph)]