diff --git a/checks/check_wheel.py b/checks/check_wheel.py
index e29ade580..c89d32ed7 100644
--- a/checks/check_wheel.py
+++ b/checks/check_wheel.py
@@ -25,10 +25,8 @@ def test_wheel_modules() -> None:
 
     elif sys.platform == "ios":
         # tkinter is not available on iOS
-        expected_modules.remove("tkinter")
-
         # libavif is not available on iOS (for now)
-        expected_modules.remove("avif")
+        expected_modules -= {"tkinter", "avif"}
 
     assert set(features.get_supported_modules()) == expected_modules
 
diff --git a/pyproject.toml b/pyproject.toml
index 0e347b161..752d49327 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -133,7 +133,7 @@ test-sources = [
 ]
 test-command = [
   "python -m selftest",
-  "python -m pytest -vv checks/check_wheel.py Tests",
+  "python -m pytest -vv -x -W always checks/check_wheel.py Tests",
 ]
 
 # There's no numpy wheel for iOS (yet...)