diff --git a/roles/docker/tasks/services/pinafore.yml b/roles/docker/tasks/services/pinafore.yml
index db27cdf..e81b872 100644
--- a/roles/docker/tasks/services/pinafore.yml
+++ b/roles/docker/tasks/services/pinafore.yml
@@ -7,6 +7,6 @@
       - name: external_services
     env:
       VIRTUAL_HOST: "{{ services.pinafore.domain }}"
-      VIRTUAL_PORT: 4002
+      VIRTUAL_PORT: "4002"
     labels:
       com.centurylinklabs.watchtower.enable: "true"