diff --git a/Lib/test/test_buffer.py b/Lib/test/test_buffer.py
--- a/Lib/test/test_buffer.py
+++ b/Lib/test/test_buffer.py
@@ -2462,6 +2462,21 @@ class TestBufferProtocol(unittest.TestCa
             self.assertEqual(m.tobytes(), b'')
             self.assertEqual(m.tolist(), [])
 
+    check_sizeof = support.check_sizeof
+
+    def test_memoryview_sizeof(self):
+        check = self.check_sizeof
+        vsize = support.calcvobjsize
+        base_struct = 'Pnin 2P2n2i5P P'
+        per_dim = '3n'
+
+        items = list(range(8))
+        check(memoryview(b''), vsize(base_struct + 1 * per_dim))
+        a = ndarray(items, shape=[2, 4], format="b")
+        check(memoryview(a), vsize(base_struct + 2 * per_dim))
+        a = ndarray(items, shape=[2, 2, 2], format="b")
+        check(memoryview(a), vsize(base_struct + 3 * per_dim))
+
     def test_memoryview_struct_module(self):
 
         class INT(object):
diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -965,8 +965,6 @@ class SizeofTest(unittest.TestCase):
         check(int(PyLong_BASE), vsize('') + 2*self.longdigit)
         check(int(PyLong_BASE**2-1), vsize('') + 2*self.longdigit)
         check(int(PyLong_BASE**2), vsize('') + 3*self.longdigit)
-        # memoryview
-        check(memoryview(b''), size('Pnin 2P2n2i5P Pn'))
         # module
         check(unittest, size('PnPPP'))
         # None
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -4276,7 +4276,7 @@ object_sizeof(PyObject *self, PyObject *
     res = 0;
     isize = self->ob_type->tp_itemsize;
     if (isize > 0)
-        res = Py_SIZE(self->ob_type) * isize;
+        res = Py_SIZE(self) * isize;
     res += self->ob_type->tp_basicsize;
 
     return PyLong_FromSsize_t(res);