diff --git a/vars/main.yml b/vars/main.yml
index a8587d3..f7a8966 100644
--- a/vars/main.yml
+++ b/vars/main.yml
@@ -42,7 +42,7 @@ nginx_templates_no_dir:
 nginx_servers_default_headers:
   'X-Frame-Options': 'DENY always'
   'X-Content-Type-Options': 'nosniff always'
-  'X-XSS-Protection': '1; mode=block'
+  'X-XSS-Protection': '"1; mode=block"'
 
 nginx_upstream_php56: 'php56'
 nginx_upstream_php70: 'php70'