diff --git a/.github/workflows/cython.yml b/.github/workflows/cython.yml
index 67b8036..2d4523a 100644
--- a/.github/workflows/cython.yml
+++ b/.github/workflows/cython.yml
@@ -83,4 +83,4 @@ jobs:
           cd cy
           python -m pip install -U pip "setuptools<60" wheel
           # python setup.py build_ext -i  # pypy should be faster with pure python
-          python runtests.py -vv --no-code-style -x Debugger -x pyximport --backends=${{ matrix.backend }} -j7
+          python runtests.py -vv --no-code-style -x Debugger -x pyximport --backends=${{ matrix.backend }} -j7 -x error_pos