diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
index f9353a5..67a72de 100644
--- a/.gitea/workflows/ci.yaml
+++ b/.gitea/workflows/ci.yaml
@@ -912,4 +912,6 @@ jobs:
         run: |
           mkdir -p /etc/nginx/http.d
           cp $(pwd)/nginx/conf.d/default.conf /etc/nginx/http.d/default.conf
+          # Add compose service names so nginx -t can resolve upstreams
+          echo "127.0.0.1 backend sabredav" >> /etc/hosts
           nginx -t