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-rw-r--r--msgpack/fallback.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/msgpack/fallback.py b/msgpack/fallback.py
index f560c7b..e8cebc1 100644
--- a/msgpack/fallback.py
+++ b/msgpack/fallback.py
@@ -814,7 +814,7 @@ class Packer(object):
self._pack_raw_header(n)
return self._buffer.write(obj)
if check(obj, memoryview):
- n = len(obj) * obj.itemsize
+ n = obj.nbytes
if n >= 2**32:
raise ValueError("Memoryview is too large")
self._pack_bin_header(n)