diff --git a/tests/test_preprocessors.py b/tests/test_preprocessors.py
index cb577de..d319ad5 100644
--- a/tests/test_preprocessors.py
+++ b/tests/test_preprocessors.py
@@ -49,7 +49,8 @@ def test_Backticks(s: str):
     assert res == "", (repr(s), repr(res))
 
 
-@given(st.from_regex(Codeblock.pattern, fullmatch=True))
+@given(st.from_regex(r"```(?:(?!`).+?)```", fullmatch=True))
+@example("""```0```""")
 @example(
     """```
 ```"""