diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 695ba21..d8c36be 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -15,6 +15,8 @@ jobs:
       - uses: bahmutov/npm-install@v1
 
       - run: yarn build:demo
+        env:
+          BASE_PATHNAME: "snk"
 
       - uses: crazy-max/ghaction-github-pages@068e494
         with: