diff --git a/activesupport/test/xml_mini/xml_mini_engine_test.rb b/activesupport/test/xml_mini/xml_mini_engine_test.rb
index a6f2086ae59c1..c795457e9b495 100644
--- a/activesupport/test/xml_mini/xml_mini_engine_test.rb
+++ b/activesupport/test/xml_mini/xml_mini_engine_test.rb
@@ -50,7 +50,7 @@ def test_file_from_xml
 
     def test_exception_thrown_on_expansion_attack
       assert_raise expansion_attack_error do
-        Hash.from_xml(<<-eoxml)
+        Hash.from_xml(<<~eoxml)
           <?xml version="1.0" encoding="UTF-8"?>
           <!DOCTYPE member [
             <!ENTITY a "&b;&b;&b;&b;&b;&b;&b;&b;&b;&b;">