diff --git a/src/api/Server.ts b/src/api/Server.ts
index 8cd6063..6668ad4 100644
--- a/src/api/Server.ts
+++ b/src/api/Server.ts
@@ -56,7 +56,7 @@ export default class Server {
       hidePoweredBy: false,
       contentSecurityPolicy: {
         directives: {
-          defaultSrc: ['self'],
+          defaultSrc: ["'self'"],
         },
       },
     }));