diff --git a/.github/workflows/functional-test.yaml b/.github/workflows/functional-test.yaml
index 3cf51895bd..9d595d50ea 100644
--- a/.github/workflows/functional-test.yaml
+++ b/.github/workflows/functional-test.yaml
@@ -88,15 +88,19 @@ jobs:
             echo "PR_NUMBER=${{ github.event.pull_request.number }}" >> $GITHUB_ENV
       - name: Set up checkout target (repository_dispatch)
         if: github.event_name == 'repository_dispatch'
-        uses: actions/github-script@v6.2.0
+        uses: actions/github-script@v6
         with:
           github-token: ${{ secrets.GH_RAD_CI_BOT_PAT }}
           script: |
             const testPayload = context.payload.client_payload;
             if (testPayload && testPayload.command === `ok-to-test`) {
-              echo "CHECKOUT_REPO=${{ github.event.pull_request.head.repo.full_name }}" >> $GITHUB_ENV
-              echo "CHECKOUT_REF=${{ github.event.pull_request.head.sha }}" >> $GITHUB_ENV
-              echo "PR_NUMBER=${{ github.event.pull_request.number }}" >> $GITHUB_ENV
+              var fs = require('fs');
+              // Set environment variables
+              fs.appendFileSync(process.env.GITHUB_ENV,
+                `CHECKOUT_REPO=${testPayload.pull_head_repo}\n`+
+                `CHECKOUT_REF=${testPayload.pull_head_ref}\n`+
+                `PR_NUMBER=${testPayload.issue.number}`
+              );
             }
       - name: Check out code
         uses: actions/checkout@v3