diff --git a/infra/docker-compose.yml b/infra/docker-compose.yml
index 7a51c3f..4dceacd 100644
--- a/infra/docker-compose.yml
+++ b/infra/docker-compose.yml
@@ -445,7 +445,8 @@ services:
     ports:
       - "8140:80"
     healthcheck:
-      test: ["CMD-SHELL", "wget -q -O /dev/null http://localhost/ || exit 1"]
+      # 127.0.0.1, not localhost: nginx listens on IPv4 only, but localhost resolves to ::1 first.
+      test: ["CMD-SHELL", "wget -q -O /dev/null http://127.0.0.1/ || exit 1"]
       interval: 5s
       timeout: 3s
       retries: 5