diff --git a/tests/misra/test_mutation.py b/tests/misra/test_mutation.py
index c804135b817..c82456e6bbf 100755
--- a/tests/misra/test_mutation.py
+++ b/tests/misra/test_mutation.py
@@ -70,6 +70,9 @@
 
 @pytest.mark.parametrize("fn, patch, should_fail", mutations)
 def test_misra_mutation(fn, patch, should_fail):
+  # Remove all files generated by cppcheck to speed tree copying
+  [os.remove(f) for f in glob.glob(f"{ROOT}/**/*", recursive=True) if f.endswith(('.dump', '.ctu-info'))]
+
   with tempfile.TemporaryDirectory() as tmp:
     shutil.copytree(ROOT, tmp, dirs_exist_ok=True)