diff --git a/Tests/test_color_lut.py b/Tests/test_color_lut.py
index 52539fee0..7414d9476 100644
--- a/Tests/test_color_lut.py
+++ b/Tests/test_color_lut.py
@@ -66,7 +66,7 @@ class TestColorLut3DCoreAPI(PillowTestCase):
             im.im.color_lut_3d('RGB', Image.LINEAR,
                 3, 2, 2, 2, [0, 0, 0] * 9)
 
-        with self.assertRaisesRegexp(TypeError, "a float is required"):
+        with self.assertRaises(TypeError):
             im.im.color_lut_3d('RGB', Image.LINEAR,
                 3, 2, 2, 2, [0, 0, "0"] * 8)