diff --git a/.github/workflows/preview-build.yml b/.github/workflows/preview-build.yml
index 197a624a4..1ce93b9d9 100644
--- a/.github/workflows/preview-build.yml
+++ b/.github/workflows/preview-build.yml
@@ -9,6 +9,7 @@ on:
   push:
     branches:
       - main
+      - master
   workflow_call:
     inputs:
       strict:
@@ -163,11 +164,11 @@ jobs:
             --paths "${PATH_PREFIX}" "${PATH_PREFIX}/*"
 
       - name: Update Link Index
-        if: github.event_name == 'push' && github.ref == 'refs/heads/main' && steps.s3-upload.outcome == 'success'
+        if: github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/master') && steps.s3-upload.outcome == 'success'
         uses: elastic/docs-builder/actions/update-link-index@main
 
       - name: Update Reference Index
-        if: github.event_name == 'push' && github.ref == 'refs/heads/main' && steps.s3-upload.outcome == 'success'
+        if: github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/master') && steps.s3-upload.outcome == 'success'
         uses: elastic/docs-builder/actions/update-reference-index@main
 
       - name: Update deployment status