diff --git a/tests/serializers_regress/tests.py b/tests/serializers_regress/tests.py
index 3173f73985..0a8267a33b 100644
--- a/tests/serializers_regress/tests.py
+++ b/tests/serializers_regress/tests.py
@@ -523,7 +523,7 @@ def streamTest(format, self):
         else:
             self.assertEqual(string_data, stream.content.decode('utf-8'))
 
-for format in serializers.get_serializer_formats():
+for format in filter(lambda x: not isinstance(serializers.get_serializer(x), serializers.BadSerializer), serializers.get_serializer_formats()):
     setattr(SerializerTests, 'test_' + format + '_serializer', curry(serializerTest, format))
     setattr(SerializerTests, 'test_' + format + '_natural_key_serializer', curry(naturalKeySerializerTest, format))
     setattr(SerializerTests, 'test_' + format + '_serializer_fields', curry(fieldsTest, format))
diff --git a/tests/timezones/tests.py b/tests/timezones/tests.py
index 49169f90f2..9390eb93df 100644
--- a/tests/timezones/tests.py
+++ b/tests/timezones/tests.py
@@ -599,7 +599,7 @@ class SerializationTests(TestCase):
         obj = next(serializers.deserialize('xml', data)).object
         self.assertEqual(obj.dt, dt)
 
-        if 'yaml' in serializers.get_serializer_formats():
+        if not isinstance(serializers.get_serializer('yaml'), serializers.BadSerializer):
             data = serializers.serialize('yaml', [Event(dt=dt)])
             self.assert_yaml_contains_datetime(data, "2011-09-01 13:20:30")
             obj = next(serializers.deserialize('yaml', data)).object
@@ -623,7 +623,7 @@ class SerializationTests(TestCase):
         obj = next(serializers.deserialize('xml', data)).object
         self.assertEqual(obj.dt, dt)
 
-        if 'yaml' in serializers.get_serializer_formats():
+        if not isinstance(serializers.get_serializer('yaml'), serializers.BadSerializer):
             data = serializers.serialize('yaml', [Event(dt=dt)])
             self.assert_yaml_contains_datetime(data, "2011-09-01 13:20:30.405060")
             obj = next(serializers.deserialize('yaml', data)).object
@@ -647,7 +647,7 @@ class SerializationTests(TestCase):
         obj = next(serializers.deserialize('xml', data)).object
         self.assertEqual(obj.dt, dt)
 
-        if 'yaml' in serializers.get_serializer_formats():
+        if not isinstance(serializers.get_serializer('yaml'), serializers.BadSerializer):
             data = serializers.serialize('yaml', [Event(dt=dt)])
             self.assert_yaml_contains_datetime(data, "2011-09-01 17:20:30.405060+07:00")
             obj = next(serializers.deserialize('yaml', data)).object
@@ -671,7 +671,7 @@ class SerializationTests(TestCase):
         obj = next(serializers.deserialize('xml', data)).object
         self.assertEqual(obj.dt, dt)
 
-        if 'yaml' in serializers.get_serializer_formats():
+        if not isinstance(serializers.get_serializer('yaml'), serializers.BadSerializer):
             data = serializers.serialize('yaml', [Event(dt=dt)])
             self.assert_yaml_contains_datetime(data, "2011-09-01 10:20:30+00:00")
             obj = next(serializers.deserialize('yaml', data)).object
@@ -695,7 +695,7 @@ class SerializationTests(TestCase):
         obj = next(serializers.deserialize('xml', data)).object
         self.assertEqual(obj.dt, dt)
 
-        if 'yaml' in serializers.get_serializer_formats():
+        if not isinstance(serializers.get_serializer('yaml'), serializers.BadSerializer):
             data = serializers.serialize('yaml', [Event(dt=dt)])
             self.assert_yaml_contains_datetime(data, "2011-09-01 13:20:30+03:00")
             obj = next(serializers.deserialize('yaml', data)).object
@@ -719,7 +719,7 @@ class SerializationTests(TestCase):
         obj = next(serializers.deserialize('xml', data)).object
         self.assertEqual(obj.dt, dt)
 
-        if 'yaml' in serializers.get_serializer_formats():
+        if not isinstance(serializers.get_serializer('yaml'), serializers.BadSerializer):
             data = serializers.serialize('yaml', [Event(dt=dt)])
             self.assert_yaml_contains_datetime(data, "2011-09-01 17:20:30+07:00")
             obj = next(serializers.deserialize('yaml', data)).object