diff --git a/Python/getargs.c b/Python/getargs.c
--- a/Python/getargs.c
+++ b/Python/getargs.c
@@ -1240,17 +1240,14 @@
                 arg, msgbuf, bufsize);
         format++;
 
-        /* Caller is interested in Py_buffer, and the object
-           supports it directly. */
+        /* Caller is interested in Py_buffer, and the object supports it
+           directly.  The request implicitly asks for PyBUF_SIMPLE, so the
+           result is C-contiguous with format 'B'. */
         if (PyObject_GetBuffer(arg, (Py_buffer*)p, PyBUF_WRITABLE) < 0) {
             PyErr_Clear();
             return converterr("read-write bytes-like object",
                               arg, msgbuf, bufsize);
         }
-        if (!PyBuffer_IsContiguous((Py_buffer*)p, 'C')) {
-            PyBuffer_Release((Py_buffer*)p);
-            return converterr("contiguous buffer", arg, msgbuf, bufsize);
-        }
         if (addcleanup(p, freelist, cleanup_buffer)) {
             return converterr(
                 "(cleanup problem)",