diff --git a/.github/workflows/check-demo.yaml b/.github/workflows/check-demo.yaml
index dfaa8b2..cf71790 100644
--- a/.github/workflows/check-demo.yaml
+++ b/.github/workflows/check-demo.yaml
@@ -36,6 +36,7 @@ jobs:
 
       - name: Start Rserve
         run: pnpm rserve &
+        working-directory: tests/testthat/sampler
 
       - run: pnpm start
         working-directory: tests/testthat/sampler