diff --git a/package.json b/package.json
index 369d728..d6fd5b3 100644
--- a/package.json
+++ b/package.json
@@ -9,11 +9,13 @@
     "md5": "^2.2.1",
     "query-string": "^5.1.1",
     "react": "latest",
+    "react-app-polyfill": "^0.2.0",
     "react-dom": "latest",
     "react-intl": "^2.8.0",
     "react-router-dom": "^4.3.1",
     "semantic-ui-css": "^2.4.1",
     "semantic-ui-react": "^0.84.0",
+    "string.prototype.startswith": "^0.2.0",
     "topola": "2.x"
   },
   "devDependencies": {
diff --git a/src/index.tsx b/src/index.tsx
index 3a822c3..af41b7a 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -1,3 +1,5 @@
+import 'react-app-polyfill/ie11';
+import 'string.prototype.startswith';
 import * as locale_en from 'react-intl/locale-data/en';
 import * as locale_pl from 'react-intl/locale-data/pl';
 import * as React from 'react';