diff --git a/tests/python_tests/image_test.py b/tests/python_tests/image_test.py
index 24c5719d2..9a764a2a4 100644
--- a/tests/python_tests/image_test.py
+++ b/tests/python_tests/image_test.py
@@ -59,7 +59,8 @@ def test_image_open_from_string():
     eq_(len(mapnik.Image.frombuffer(buffer(im1.tostring('jpeg'))).tostring()),length)
     
     # TODO - https://github.com/mapnik/mapnik/issues/1831
-    #eq_(len(mapnik.Image.fromstring(im1.tostring('tiff')).tostring()),length)
+    eq_(len(mapnik.Image.fromstring(im1.tostring('tiff')).tostring()),length)
+    eq_(len(mapnik.Image.frombuffer(buffer(im1.tostring('tiff'))).tostring()),length)
 
 if __name__ == "__main__":
     setup()