diff --git a/Lib/test/test_pyexpat.py b/Lib/test/test_pyexpat.py
index aaa91aca36e3c4..5cb84862829fc3 100644
--- a/Lib/test/test_pyexpat.py
+++ b/Lib/test/test_pyexpat.py
@@ -735,7 +735,7 @@ def test_trigger_leak(self):
     def test_deeply_nested_content_model(self):
         # This should raise a RecursionError and not crash.
         # See https://github.com/python/cpython/issues/145986.
-        N = 500_000
+        N = 800_000
         data = (
             b'<!DOCTYPE root [\n<!ELEMENT root '
             + b'(a, ' * N + b'a' + b')' * N