diff --git a/.github/workflows/optimize-images.yml b/.github/workflows/optimize-images.yml
index 4679d6aaf87a..88e05bffb7a5 100644
--- a/.github/workflows/optimize-images.yml
+++ b/.github/workflows/optimize-images.yml
@@ -23,6 +23,10 @@ jobs:
         uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
         with:
           ref: ${{ github.head_ref }}
+          # Need to specify a PAT here because otherwise GITHUB_TOKEN is used
+          # by default.  Workflows won't trigger in that case because actions
+          # performed with GITHUB_TOKEN don't trigger other workflows.
+          token: ${{ secrets.DOCUBOT_REPO_PAT }}
 
       - name: Check out base ref
         run: git fetch --no-tags --depth=1 origin $GITHUB_BASE_REF