diff --git a/tests/test_mutate.py b/tests/test_mutate.py
index 99c7959c..562b79f3 100644
--- a/tests/test_mutate.py
+++ b/tests/test_mutate.py
@@ -122,7 +122,7 @@ def assert_mutate_N(self: unittest.TestCase):
 
         args = td[test]["args"]
 
-        args = _recursive_replace(args, "<long_sequence_with_n>", ls_with_n, exact=True)
+        args = _recursive_replace(args, "<long_sequence_with_N>", ls_with_n, exact=True)
 
         result = do_call(func, args)