diff --git a/test/test_helper.rb b/test/test_helper.rb
index 1ff99cac..d270393b 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -416,7 +416,7 @@ class ActiveSupport::TestCase
   # Checks that the response is a valid JSON string
   def self.should_be_a_valid_json_string
     should "be a valid JSON string (or empty)" do
-      assert (response.body.blank? || ActiveSupport::JSON.decode(response.body))
+      assert(response.body.blank? || ActiveSupport::JSON.decode(response.body))
     end
   end