diff --git a/manifests/common/app.yaml b/manifests/common/app.yaml
index 52c37bb..924b78c 100644
--- a/manifests/common/app.yaml
+++ b/manifests/common/app.yaml
@@ -6,10 +6,10 @@ metadata:
   annotations:
     cert-manager.io/cluster-issuer: letsencrypt-prod
     nginx.ingress.kubernetes.io/configuration-snippet: |
-      more_set_headers X-Frame-Options SAMEORIGIN;
-      more_set_headers X-Content-Type-Options nosniff;
-      more_set_headers X-XSS-Protection "1; mode=block";
-      more_set_headers Content-Security-Policy "frame-ancestors 'self'";
+      more_set_headers "X-Frame-Options: SAMEORIGIN";
+      more_set_headers "X-Content-Type-Options: nosniff";
+      more_set_headers "X-XSS-Protection: 1; mode=block";
+      more_set_headers "Content-Security-Policy: frame-ancestors 'self'";
 
     nginx.ingress.kubernetes.io/server-snippet: |
       if ($request_uri = /) {