diff --git a/.github/workflows/core-tests.yml b/.github/workflows/core-tests.yml
index b286d22..4aeb30f 100644
--- a/.github/workflows/core-tests.yml
+++ b/.github/workflows/core-tests.yml
@@ -17,7 +17,7 @@ jobs:
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy-3.10"]
     env:
       TOTAL_COVERAGE: "-"
-      PYTEST_MATCH_EXPRESSION: ${{ (startsWith(matrix.python-version, 'pypy') && "-k not test_types") || '' }}
+      PYTEST_MATCH_EXPRESSION: ${{ (startsWith(matrix.python-version, 'pypy') && '-k "not test_types"') || '' }}
 
     steps:
     - uses: actions/checkout@v3