diff --git a/Tests/test_file_pdf.py b/Tests/test_file_pdf.py
index 7b024426b..983bfffe7 100644
--- a/Tests/test_file_pdf.py
+++ b/Tests/test_file_pdf.py
@@ -26,6 +26,11 @@ class TestFilePdf(PillowTestCase):
                 self.assertGreater(len(pdf.pages), 1)
             else:
                 self.assertGreater(len(pdf.pages), 0)
+        with open(outfile, 'rb') as fp:
+            contents = fp.read()
+        size = tuple(int(d) for d in
+                     contents.split(b'/MediaBox [ 0 0 ')[1].split(b']')[0].split())
+        self.assertEqual(im.size, size)
 
         return outfile
 
diff --git a/src/PIL/PdfImagePlugin.py b/src/PIL/PdfImagePlugin.py
index 702aaa392..7b92a83ae 100644
--- a/src/PIL/PdfImagePlugin.py
+++ b/src/PIL/PdfImagePlugin.py
@@ -166,7 +166,7 @@ def _save(im, fp, filename, save_all=False):
                     # FIXME: the hex encoder doesn't support packed 1-bit
                     # images; do things the hard way...
                     data = im.tobytes("raw", "1")
-                    im = Image.new("L", (len(data), 1), None)
+                    im = Image.new("L", im.size)
                     im.putdata(data)
                 ImageFile._save(im, op, [("hex", (0, 0)+im.size, 0, im.mode)])
             elif filter == "DCTDecode":