diff --git a/curriculum/challenges/english/09-information-security/information-security-with-helmetjs/configure-helmet-using-the-parent-helmet-middleware.md b/curriculum/challenges/english/09-information-security/information-security-with-helmetjs/configure-helmet-using-the-parent-helmet-middleware.md
index 64288545a5..8f96da298a 100644
--- a/curriculum/challenges/english/09-information-security/information-security-with-helmetjs/configure-helmet-using-the-parent-helmet-middleware.md
+++ b/curriculum/challenges/english/09-information-security/information-security-with-helmetjs/configure-helmet-using-the-parent-helmet-middleware.md
@@ -21,7 +21,7 @@ app.use(helmet({
   },
   contentSecurityPolicy: {    // enable and configure
     directives: {
-      defaultSrc: ["self"],
+      defaultSrc: ["'self'"],
       styleSrc: ['style.com'],
     }
   },