diff --git a/k8s/apps/xandikos/external-secrets.yaml b/k8s/apps/xandikos/external-secrets.yaml
index be3c3ca..587598e 100644
--- a/k8s/apps/xandikos/external-secrets.yaml
+++ b/k8s/apps/xandikos/external-secrets.yaml
@@ -14,7 +14,7 @@ spec:
         DB_HOST: psql.psql.svc
         DB_USER: mmdl
         DB_NAME: mmdl
-        DB_PORT: 5432
+        DB_PORT: "5432"
         DB_PASS: |-
           {{ .pg_pass }}
         AES_PASSWORD: |-