diff --git a/test/parse/test_attribute_list_declaration.rb b/test/parse/test_attribute_list_declaration.rb
index bf2c1ce3..f9e8cf5d 100644
--- a/test/parse/test_attribute_list_declaration.rb
+++ b/test/parse/test_attribute_list_declaration.rb
@@ -10,7 +10,9 @@ class TestParseAttributeListDeclaration < Test::Unit::TestCase
     def test_linear_performance_gt
       seq = [10000, 50000, 100000, 150000, 200000]
       assert_linear_performance(seq, rehearsal: 10) do |n|
-        REXML::Document.new('<!DOCTYPE schema SYSTEM "foo.dtd" [<!ATTLIST ' + " " * n + ' root v CDATA #FIXED "test">]>')
+        REXML::Document.new("<!DOCTYPE schema SYSTEM \"foo.dtd\" [<!ATTLIST " +
+                            " " * n +
+                            " root v CDATA #FIXED \"test\">]>")
       end
     end
   end