diff --git a/Tests/images/hopper.pnm b/Tests/images/hopper.pnm
new file mode 100644
index 000000000..52368b2e2
Binary files /dev/null and b/Tests/images/hopper.pnm differ
diff --git a/Tests/test_file_ppm.py b/Tests/test_file_ppm.py
index 47f8b845e..b9241e81d 100644
--- a/Tests/test_file_ppm.py
+++ b/Tests/test_file_ppm.py
@@ -1,4 +1,4 @@
-from .helper import PillowTestCase
+from .helper import PillowTestCase, hopper
 
 from PIL import Image
 
@@ -34,6 +34,16 @@ class TestFilePpm(PillowTestCase):
         reloaded = Image.open(f)
         self.assert_image_equal(im, reloaded)
 
+    def test_pnm(self):
+        im = Image.open('Tests/images/hopper.pnm')
+        self.assert_image_similar(im, hopper(), 0.0001)
+
+        f = self.tempfile('temp.pnm')
+        im.save(f)
+
+        reloaded = Image.open(f)
+        self.assert_image_equal(im, reloaded)
+
     def test_truncated_file(self):
         path = self.tempfile('temp.pgm')
         with open(path, 'w') as f: