diff --git a/Tests/test_image_resize.py b/Tests/test_image_resize.py
index 38a60564c..de7b6abc3 100644
--- a/Tests/test_image_resize.py
+++ b/Tests/test_image_resize.py
@@ -97,6 +97,9 @@ class TestImagingCoreResize(PillowTestCase):
             self.assertEqual(r.size, (212, 195))
             self.assertEqual(r.getdata()[0], (0,0,0))
 
+    def test_unknown_filter(self):
+        self.assertRaises(ValueError, self.resize, hopper(), (10, 10), 9)
+
 
 class TestImageResize(PillowTestCase):