diff --git a/tests/common.py b/tests/common.py
index c67db04e5..ce1f2848b 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -5,6 +5,7 @@
 import functools
 import os
 import types
+import typing
 from typing import TYPE_CHECKING
 from unittest import TestCase as _Base
 
@@ -113,13 +114,14 @@ def assertNdarraysEqual(a: np.ndarray, b: np.ndarray) -> None:
         assert False, f"ndarrays contents differ\n{msg}"
 
 
+@typing.no_type_check
 def assertImagesAlmostEqual(a: Image, b: Image, epsilon: float = 0.1) -> None:
     import PIL.ImageFilter as ImageFilter
 
     assert a.size == b.size
     a = a.filter(ImageFilter.BLUR).getdata()
     b = b.filter(ImageFilter.BLUR).getdata()
-    for i, ax, bx in zip(range(len(a)), a, b):  # type: ignore
+    for i, ax, bx in zip(range(len(a)), a, b):
         diff = sum(abs(ac / 256 - bc / 256) for ac, bc in zip(ax, bx)) / 3
         assert diff < epsilon, f"images differed by {diff} at index {i}; {ax} {bx}"