diff --git a/test/rdoc/test_rdoc_ri_driver.rb b/test/rdoc/test_rdoc_ri_driver.rb
index bf0719fae6..39e6e67759 100644
--- a/test/rdoc/test_rdoc_ri_driver.rb
+++ b/test/rdoc/test_rdoc_ri_driver.rb
@@ -598,7 +598,7 @@ def test_display_class
     assert_match %r%^= Attributes:%, out
     assert_match %r%^  attr_accessor attr%, out
 
-    assert_equal 1, out.scan(/-\n/).length
+    assert_equal 1, out.scan(/^-{50,}$/).length, out
 
     refute_match %r%Foo::Bar#blah%, out
   end
@@ -622,7 +622,7 @@ def test_display_class_all
     assert_match %r%^= Attributes:%, out
     assert_match %r%^  attr_accessor attr%, out
 
-    assert_equal 6, out.scan(/-\n/).length
+    assert_equal 6, out.scan(/^-{50,}$/).length, out
 
     assert_match %r%Foo::Bar#blah%, out
   end