diff --git a/test/ruby/test_sprintf.rb b/test/ruby/test_sprintf.rb
index 467e86dd63..5ecabcc052 100644
--- a/test/ruby/test_sprintf.rb
+++ b/test/ruby/test_sprintf.rb
@@ -257,4 +257,12 @@ class TestSprintf < Test::Unit::TestCase
   def test_rb_sprintf
     assert(T012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789.new.inspect =~ /^#<TestSprintf::T012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789:0x[0-9a-f]+>$/)
   end
+
+  def test_negative_hex
+    s1 = sprintf("%0x", -0x40000000)
+    s2 = sprintf("%0x", -0x40000001)
+    b1 = (/\.\./ =~ s1) != nil
+    b2 = (/\.\./ =~ s2) != nil
+    assert(b1 == b2, "[ruby-dev:33224]")
+  end
 end