Fix failure introduced in r80929.
diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py
index 1b13274..3a5bd30 100644
--- a/Lib/test/test_zlib.py
+++ b/Lib/test/test_zlib.py
@@ -101,7 +101,7 @@
# Generate 10MB worth of random, and expand it by repeating it.
# The assumption is that zlib's memory is not big enough to exploit
# such spread out redundancy.
- data = b''.join([random.getrandbits(8 * _1M).to_bytes(_1M, 'little')
+ data = b''.join([binascii.a2b_hex(fmt % random.getrandbits(8 * _1M))
for i in range(10)])
data = data * (size // len(data) + 1)
try: