diff --git a/test/test_helper.rb b/test/test_helper.rb
index 810bdb3..e0011b2 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -77,7 +77,7 @@ class Test::Unit::TestCase
   end
 
   def assert_equivalent(enum1, enum2)
-    assert((enum1 - enum2) == [] && (enum2 - enum1) == []), "<#{enum1.inspect}> expected to be equivalent to <#{enum2.inspect}>"
+    assert( ((enum1 - enum2) == []) && ((enum2 - enum1) == []), "<#{enum1.inspect}> expected to be equivalent to <#{enum2.inspect}>")
   end
 
   private
--
libgit2 0.21.2