diff --git a/activerecord/test/cases/named_scope_test.rb b/activerecord/test/cases/named_scope_test.rb
index 4fe7f4f5b9dbf..acc3b3016a3f7 100644
--- a/activerecord/test/cases/named_scope_test.rb
+++ b/activerecord/test/cases/named_scope_test.rb
@@ -250,7 +250,7 @@ def test_find_all_should_behave_like_select
   end
 
   def test_rand_should_select_a_random_object_from_proxy
-    assert Topic.approved.rand.is_a? Topic
+    assert Topic.approved.rand.is_a?(Topic)
   end
 
   def test_should_use_where_in_query_for_named_scope