diff --git a/.github/workflows/ci-testing-pull-request.yml b/.github/workflows/ci-testing-pull-request.yml
index c96a81b1d777..69556433e6f5 100644
--- a/.github/workflows/ci-testing-pull-request.yml
+++ b/.github/workflows/ci-testing-pull-request.yml
@@ -34,6 +34,7 @@ jobs:
       - name: Regenerate specs and check
         run: |
           make devenv
+          source .venv/bin/activate
           make openapi-specs
           if ! ./ci/github/helpers/openapi-specs-diff.bash diff \
             https://raw.githubusercontent.com/${{ github.event.pull_request.head.repo.full_name }}/refs/heads/${{ github.event.pull_request.head.ref }} \