diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6954e3fd..ec7cba0d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -105,7 +105,11 @@ jobs:
           isort . --check --verbose --only-modified --diff
       - name: Test
         run: |
-          pytest ./tests
+          if github.event_name == 'schedule'; then
+            pytest --runslow ./tests
+          else
+            pytest ./tests
+          fi
       - name: Doc build
         run: |
           make html -C docs/ SPHINXOPTS="-W --keep-going -n"