- Issue #10181: New memoryview implementation fixes multiple ownership
  and lifetime issues of dynamically allocated Py_buffer members (#9990)
  as well as crashes (#8305, #7433). Many new features have been added
  (See whatsnew/3.3), and the documentation has been updated extensively.
  The ndarray test object from _testbuffer.c implements all aspects of
  PEP-3118, so further development towards the complete implementation
  of the PEP can proceed in a test-driven manner.

  Thanks to Nick Coghlan, Antoine Pitrou and Pauli Virtanen for review
  and many ideas.

- Issue #12834: Fix incorrect results of memoryview.tobytes() for
  non-contiguous arrays.

- Issue #5231: Introduce memoryview.cast() method that allows changing
  format and shape without making a copy of the underlying memory.
diff --git a/Objects/object.c b/Objects/object.c
index 2665d21..70d320c 100644
--- a/Objects/object.c
+++ b/Objects/object.c
@@ -1650,6 +1650,9 @@
     if (PyType_Ready(&PyProperty_Type) < 0)
         Py_FatalError("Can't initialize property type");
 
+    if (PyType_Ready(&_PyManagedBuffer_Type) < 0)
+        Py_FatalError("Can't initialize managed buffer type");
+
     if (PyType_Ready(&PyMemoryView_Type) < 0)
         Py_FatalError("Can't initialize memoryview type");