diff --git a/resources/js/rambox-service-api.js b/resources/js/rambox-service-api.js
index a1a3c58a..88084c91 100644
--- a/resources/js/rambox-service-api.js
+++ b/resources/js/rambox-service-api.js
@@ -63,3 +63,11 @@ Notification = function(title, options) {
 Notification.prototype = NativeNotification.prototype;
 Notification.permission = NativeNotification.permission;
 Notification.requestPermission = NativeNotification.requestPermission.bind(Notification);
+
+/**
+ * Disable eval for security reasons.
+ */
+  // eslint-disable-next-line no-eval
+  window.eval = global.eval = function () {
+    throw new Error(`Sorry, this app does not support window.eval().`);
+  };