diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py
index 7c2816f715..da34694fed 100644
--- a/django/db/models/sql/query.py
+++ b/django/db/models/sql/query.py
@@ -579,7 +579,7 @@ class BaseQuery(object):
                             aliases.add(c_alias)
                             col_aliases.add(c_alias)
                         else:
-                            result.append('%s AS %s' % (r, col[1]))
+                            result.append('%s AS %s' % (r, qn2(col[1])))
                             aliases.add(r)
                             col_aliases.add(col[1])
                     else: