diff --git a/test/test_forwardable.rb b/test/test_forwardable.rb
index deb0b5d..9ed3300 100644
--- a/test/test_forwardable.rb
+++ b/test/test_forwardable.rb
@@ -306,7 +306,7 @@ class Foo2 < BasicObject
 
   def test_basicobject_subclass
     bug11616 = '[ruby-core:71176] [Bug #11616]'
-    assert_raise_with_message(NameError, /`bar'/, bug11616) {
+    assert_raise_with_message(NameError, /[`']bar'/, bug11616) {
       Foo2.new.baz
     }
   end