diff --git a/src/executor/nginx.js b/src/executor/nginx.js
index b011b91..4da07e6 100644
--- a/src/executor/nginx.js
+++ b/src/executor/nginx.js
@@ -197,7 +197,7 @@ class NginxExecutor {
             }
             node.location[idx]._add('if', `($http_referer !~ "^https?://${info.dom}")`);
             node.location[idx]._add('if', `($http_user_agent ~ "^Mozilla")`);
-            node.location[idx]._add('if', `$reject = "12"`);
+            node.location[idx]._add('if', `($reject = "12")`);
             node.location[idx].if[0]._add('set', '$reject "${reject}1"');
             node.location[idx].if[1]._add('set', '$reject "${reject}2"');
             node.location[idx].if[2]._add('rewrite', '^ /deceptive.html last');