diff --git a/django/utils/feedgenerator.py b/django/utils/feedgenerator.py
index c67fedb277..3fae71cdee 100644
--- a/django/utils/feedgenerator.py
+++ b/django/utils/feedgenerator.py
@@ -427,7 +427,7 @@ class Atom1Feed(SyndicationFeed):
             handler.addQuickElement("summary", item['description'], {"type": "html"})
 
         # Enclosures.
-        for enclosure in item.get('enclosures') or []:
+        for enclosure in item['enclosures']:
             handler.addQuickElement('link', '', {
                 'rel': 'enclosure',
                 'href': enclosure.url,
diff --git a/tests/syndication_tests/feeds.py b/tests/syndication_tests/feeds.py
index ce938b8356..f4162b345e 100644
--- a/tests/syndication_tests/feeds.py
+++ b/tests/syndication_tests/feeds.py
@@ -208,6 +208,6 @@ class TestMultipleEnclosureAtomFeed(TestAtomFeed):
     """
     def item_enclosures(self, item):
         return [
-            feedgenerator.Enclosure('http://example.com/hello.png', 0, 'image/png'),
-            feedgenerator.Enclosure('http://example.com/goodbye.png', 0, 'image/png'),
+            feedgenerator.Enclosure('http://example.com/hello.png', '0', 'image/png'),
+            feedgenerator.Enclosure('http://example.com/goodbye.png', '0', 'image/png'),
         ]
diff --git a/tests/syndication_tests/tests.py b/tests/syndication_tests/tests.py
index 5a7cfbb057..5369320bdd 100644
--- a/tests/syndication_tests/tests.py
+++ b/tests/syndication_tests/tests.py
@@ -300,7 +300,7 @@ class SyndicationFeedTest(FeedTestCase):
         self.assertNotEqual(published, updated)
 
     def test_atom_single_enclosure(self):
-        response = self.client.get('/syndication/rss2/single-enclosure/')
+        response = self.client.get('/syndication/atom/single-enclosure/')
         feed = minidom.parseString(response.content).firstChild
         items = feed.getElementsByTagName('entry')
         for item in items:
@@ -309,7 +309,7 @@ class SyndicationFeedTest(FeedTestCase):
             self.assertEqual(len(links), 1)
 
     def test_atom_multiple_enclosures(self):
-        response = self.client.get('/syndication/rss2/single-enclosure/')
+        response = self.client.get('/syndication/atom/multiple-enclosure/')
         feed = minidom.parseString(response.content).firstChild
         items = feed.getElementsByTagName('entry')
         for item in items: