diff --git a/CHANGELOG.md b/CHANGELOG.md
index d27c136a3..6da0abdca 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ This document follows the conventions laid out in [Keep a CHANGELOG][].
 ## [Unreleased][]
 
 ### Added
+-   Added Python 3 buffer api support and PyBuffer interface for fast byte and numpy array read/write ([#980][p980])
 
 ### Changed
 -   Drop support for Python 2, 3.4, and 3.5
@@ -51,7 +52,6 @@ This version improves performance on benchmarks significantly compared to 2.3.
 -   Support for Python 3.8
 -   Codecs as the designated way to handle automatic conversions between
     .NET and Python types
--   Added Python 3 buffer api support and PyBuffer interface for fast byte and numpy array read/write ([#980][p980])
 
 ### Changed
 
diff --git a/src/runtime/runtime.cs b/src/runtime/runtime.cs
index 915e1db00..f00b18a68 100644
--- a/src/runtime/runtime.cs
+++ b/src/runtime/runtime.cs
@@ -1154,6 +1154,8 @@ internal static long PyObject_Size(IntPtr pointer)
         //====================================================================
         // Python buffer API
         //====================================================================
+        [DllImport(_PythonDll, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern int PyObject_CheckBuffer(IntPtr obj);
 
         [DllImport(_PythonDll, CallingConvention = CallingConvention.Cdecl)]
         internal static extern int PyObject_GetBuffer(IntPtr exporter, ref Py_buffer view, int flags);