diff --git a/.github/workflows/visual-diff.yml b/.github/workflows/visual-diff.yml
index 744233c..11e3f77 100644
--- a/.github/workflows/visual-diff.yml
+++ b/.github/workflows/visual-diff.yml
@@ -22,6 +22,9 @@ on:
       - 'styles/**'
       - 'tailwind.config.js'
       - 'postcss.config.js'
+      # Baseline/spec-only PRs (e.g. seed-visual-baselines-on-linux) must
+      # exercise Screenshot diff now that tests/visual/__screenshots__/ is committed.
+      - 'tests/visual/**'
 
 concurrency:
   group: visual-diff-${{ github.event.pull_request.number }}