diff -r 69bdf8bdfd61 Lib/imghdr.py
--- a/Lib/imghdr.py	Thu Nov 10 13:28:03 2016 -0500
+++ b/Lib/imghdr.py	Thu Nov 10 17:12:16 2016 -0400
@@ -36,7 +36,7 @@
 
 def test_jpeg(h, f):
     """JPEG data in JFIF or Exif format"""
-    if h[6:10] in (b'JFIF', b'Exif'):
+    if h[6:10] in (b'JFIF', b'Exif') or h[:2] == b'\xff\xd8':
         return 'jpeg'
 
 tests.append(test_jpeg)
diff -r 69bdf8bdfd61 Lib/test/imghdrdata/python1.jpg
Binary file Lib/test/imghdrdata/python1.jpg has changed
diff -r 69bdf8bdfd61 Lib/test/test_imghdr.py
--- a/Lib/test/test_imghdr.py	Thu Nov 10 13:28:03 2016 -0500
+++ b/Lib/test/test_imghdr.py	Thu Nov 10 17:12:16 2016 -0400
@@ -14,6 +14,7 @@
     ('python.pgm', 'pgm'),
     ('python.pbm', 'pbm'),
     ('python.jpg', 'jpeg'),
+    ('python1.jpg', 'jpeg'),
     ('python.ras', 'rast'),
     ('python.sgi', 'rgb'),
     ('python.tiff', 'tiff'),