diff --git a/django/db/models/query.py b/django/db/models/query.py
index 12731caa94..fb6d116a6e 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -513,7 +513,9 @@ class ValuesQuerySet(QuerySet):
         # names of the model fields to select.
 
     def iterator(self):
-        self.query.trim_extra_select(self.extra_names)
+        if (not self.extra_names and 
+            len(self.field_names) != len(self.model._meta.fields)):
+            self.query.trim_extra_select(self.extra_names)
         names = self.query.extra_select.keys() + self.field_names
         for row in self.query.results_iter():
             yield dict(zip(names, row))
diff --git a/tests/regressiontests/queries/models.py b/tests/regressiontests/queries/models.py
index 8c9334c849..aa78d6583a 100644
--- a/tests/regressiontests/queries/models.py
+++ b/tests/regressiontests/queries/models.py
@@ -507,6 +507,12 @@ True
 >>> [sorted(d.items()) for d in dicts]
 [[('id', 1), ('rank', 2)], [('id', 2), ('rank', 1)], [('id', 3), ('rank', 3)]]
 
+Bug #7256
+# An empty values() call includes all aliases, including those from an extra()
+>>> dicts = qs.values().order_by('id')
+>>> [sorted(d.items()) for d in dicts]
+[[('author_id', 2), ('good', 0), ('id', 1), ('rank', 2)], [('author_id', 3), ('good', 0), ('id', 2), ('rank', 1)], [('author_id', 1), ('good', 1), ('id', 3), ('rank', 3)]]
+
 Bugs #2874, #3002
 >>> qs = Item.objects.select_related().order_by('note__note', 'name')
 >>> list(qs)