diff --git a/Tests/test_file_jpeg.py b/Tests/test_file_jpeg.py
index 4bb6f1e92..ef974cfe7 100644
--- a/Tests/test_file_jpeg.py
+++ b/Tests/test_file_jpeg.py
@@ -1,6 +1,5 @@
 from tester import *
 
-import array
 import random
 
 from PIL import Image
@@ -137,8 +136,7 @@ def test_progressive_large_buffer():
 
 def test_progressive_large_buffer_highest_quality():
     f = tempfile('temp.jpg')
-    a = array.array('B')
-    a.extend(random.randint(0, 255) for _ in range(256 * 256 * 3))
+    a = b''.join(chr(random.randint(0, 255)) for _ in range(256 * 256 * 3))
     im = Image.frombuffer("RGB", (256, 256), a, "raw", "RGB", 0, 1)
     # this requires more bytes than pixels in the image
     im.save(f, format="JPEG", progressive=True, quality=100)