diff --git a/Lib/robotparser.py b/Lib/robotparser.py
index a7137a3..4e13f7f 100644
--- a/Lib/robotparser.py
+++ b/Lib/robotparser.py
@@ -160,7 +160,10 @@
 
 
     def __str__(self):
-        return ''.join([str(entry) + "\n" for entry in self.entries])
+        entries = self.entries
+        if self.default_entry is not None:
+            entries = entries + [self.default_entry]
+        return '\n'.join(map(str, entries)) + '\n'
 
 
 class RuleLine:
diff --git a/Lib/test/test_robotparser.py b/Lib/test/test_robotparser.py
index 8ed5d89..ba7ccf8 100644
--- a/Lib/test/test_robotparser.py
+++ b/Lib/test/test_robotparser.py
@@ -136,6 +136,31 @@
     bad = ['/cyberworld/map/index.html']
 
 
+class StringFormattingTest(BaseRobotTest, unittest.TestCase):
+    robots_txt = """\
+User-agent: *
+Crawl-delay: 1
+Request-rate: 3/15
+Disallow: /cyberworld/map/ # This is an infinite virtual URL space
+
+# Cybermapper knows where to go.
+User-agent: cybermapper
+Disallow: /some/path
+    """
+
+    expected_output = """\
+User-agent: cybermapper
+Disallow: /some/path
+
+User-agent: *
+Disallow: /cyberworld/map/
+
+"""
+
+    def test_string_formatting(self):
+        self.assertEqual(str(self.parser), self.expected_output)
+
+
 class RobotHandler(BaseHTTPRequestHandler):
 
     def do_GET(self):
@@ -226,6 +251,7 @@
         UseFirstUserAgentWildcardTest,
         EmptyQueryStringTest,
         DefaultEntryTest,
+        StringFormattingTest,
         PasswordProtectedSiteTestCase,
         NetworkTestCase)