1 files changed, 7 insertions, 1 deletions
diff --git a/django/db/models/sql/where.py b/django/db/models/sql/where.py
index 0ca95f7018..1635a686c2 100644
--- a/django/db/models/sql/where.py
+++ b/django/db/models/sql/where.py
@@ -26,6 +26,7 @@ class WhereNode(tree.Node):
     contains_aggregate attribute.
     """
     default = AND
+    resolved = False
 
     def split_having(self, negated=False):
         """
@@ -108,7 +109,7 @@ class WhereNode(tree.Node):
                 # around the inner SQL in the negated case, even if the
                 # inner SQL contains just a single expression.
                 sql_string = 'NOT (%s)' % sql_string
-            elif len(result) > 1:
+            elif len(result) > 1 or self.resolved:
                 sql_string = '(%s)' % sql_string
         return sql_string, result_params
 
@@ -181,6 +182,11 @@ class WhereNode(tree.Node):
     def is_summary(self):
         return any(child.is_summary for child in self.children)
 
+    def resolve_expression(self, *args, **kwargs):
+        clone = self.clone()
+        clone.resolved = True
+        return clone
+
 
 class NothingNode:
     """A node that matches nothing."""