diff --git a/.github/workflows/ci_workflows.yml b/.github/workflows/ci_workflows.yml
index 08dbb634..71389ffc 100644
--- a/.github/workflows/ci_workflows.yml
+++ b/.github/workflows/ci_workflows.yml
@@ -14,9 +14,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Check base branch
-      uses: pllim/action-check_pr_basebranch@main
+      uses: actions/github-script@v3
+      if: github.event_name == 'pull_request'
       with:
-        BASEBRANCH_NAME: master
+        script: |
+          const allowed_basebranch = 'master';
+          const pr = context.payload.pull_request;
+          if (pr.base.ref !== allowed_basebranch) {
+            core.setFailed(`PR opened against ${pr.base.ref}, not ${allowed_basebranch}`);
+          } else {
+            core.info(`PR opened correctly against ${allowed_basebranch}`);
+          }
     # TODO: Fix this for PRs
     - name: Cancel Previous Runs
       uses: styfle/cancel-workflow-action@ce177499ccf9fd2aded3b0426c97e5434c2e8a73