diff --git a/msgpack/_packer.pyx b/msgpack/_packer.pyx
@@ -44,8 +44,6 @@ cdef extern from "pack.h":
    int msgpack_pack_timestamp(msgpack_packer* x, long long seconds, unsigned long nanoseconds);
    int msgpack_pack_unicode(msgpack_packer* pk, object o, long long limit)

-cdef extern from "buff_converter.h":
-    object buff_to_buff(char *, Py_ssize_t)

cdef int DEFAULT_RECURSE_LIMIT=511
cdef long long ITEM_LIMIT = (2**32)-1
@@ -371,4 +369,10 @@ cdef class Packer(object):

    def getbuffer(self):
        """Return view of internal buffer."""
-        return buff_to_buff(self.pk.buf, self.pk.length)
diff --git a/msgpack/buff_converter.h b/msgpack/buff_converter.h