diff --git a/Tests/test_file_bmp.py b/Tests/test_file_bmp.py
index 6469a5bab..dd5f31fd2 100644
--- a/Tests/test_file_bmp.py
+++ b/Tests/test_file_bmp.py
@@ -1,6 +1,7 @@
 from tester import *
 
 from PIL import Image
+import io
 
 def roundtrip(im):
     outfile = tempfile("temp.bmp")
@@ -23,3 +24,15 @@ def test_sanity():
     roundtrip(lena("RGB"))
 
 
+def test_save_to_bytes():
+    output = io.BytesIO()
+    im = lena()
+    im.save(output, "BMP")
+
+    output.seek(0)
+    reloaded = Image.open(output)
+    
+    assert_equal(im.mode, reloaded.mode)
+    assert_equal(im.size, reloaded.size)
+    assert_equal(reloaded.format, "BMP")
+