diff --git a/spacy/tokens/_serialize.py b/spacy/tokens/_serialize.py
index 67ad9a21a..3ca3028b6 100644
--- a/spacy/tokens/_serialize.py
+++ b/spacy/tokens/_serialize.py
@@ -155,9 +155,9 @@ class DocBin(object):
         msg = srsly.msgpack_loads(zlib.decompress(bytes_data))
         self.attrs = msg["attrs"]
         self.strings = set(msg["strings"])
-        lengths = numpy.fromstring(msg["lengths"], dtype="int32")
-        flat_spaces = numpy.fromstring(msg["spaces"], dtype=bool)
-        flat_tokens = numpy.fromstring(msg["tokens"], dtype="uint64")
+        lengths = numpy.frombuffer(msg["lengths"], dtype="int32")
+        flat_spaces = numpy.frombuffer(msg["spaces"], dtype=bool)
+        flat_tokens = numpy.frombuffer(msg["tokens"], dtype="uint64")
         shape = (flat_tokens.size // len(self.attrs), len(self.attrs))
         flat_tokens = flat_tokens.reshape(shape)
         flat_spaces = flat_spaces.reshape((flat_spaces.size, 1))