diff --git a/_collections_abc.py b/_collections_abc.py
index 005d884..f379d09 100644
--- a/_collections_abc.py
+++ b/_collections_abc.py
@@ -691,7 +691,7 @@ class Mapping(Collection):
 Mapping.register(mappingproxy)
 
 
-class MappingView(Sized):
+class MappingView(Collection):
 
     __slots__ = '_mapping',
 
diff --git a/test/test_collections.py b/test/test_collections.py
index 47f7562..c462694 100644
--- a/test/test_collections.py
+++ b/test/test_collections.py
@@ -784,13 +784,13 @@ class TestOneTrickPonyABCs(ABCTestCase):
             self.assertFalse(issubclass(type(x), Collection), repr(type(x)))
         # Check some non-collection iterables
         non_col_iterables = [_test_gen(), iter(b''), iter(bytearray()),
-                             (x for x in []), dict().values()]
+                             (x for x in [])]
         for x in non_col_iterables:
             self.assertNotIsInstance(x, Collection)
             self.assertFalse(issubclass(type(x), Collection), repr(type(x)))
         # Check some collections
-        samples = [set(), frozenset(), dict(), bytes(), str(), tuple(),
-                   list(), dict().keys(), dict().items()]
+        samples = [set(), frozenset(), dict(), bytes(), str(), tuple(), list(),
+                   dict().keys(), dict().values(), dict().items()]
         for x in samples:
             self.assertIsInstance(x, Collection)
             self.assertTrue(issubclass(type(x), Collection), repr(type(x)))