diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 6c651cc9..4862e961 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -138,7 +138,7 @@ jobs:
 
       - name: Check that compiled Python dependency manifests are up-to-date with their sources
         # FIXME: There are issues related to testing with multiple Python versions.
-        if: ${{ startsWith(matrix.python_version, '3.8.') }}
+        if: ${{ startsWith(steps.set_up_python.outputs.python-version, '3.8.') }}
         run: |
           source "$PYTHON_VIRTUALENV_ACTIVATE"
           make python-deps-sync-check