diff --git a/src/index.ts b/src/index.ts
index b2a374f..d77f423 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -55,7 +55,11 @@ function connectTerm() {
   });
 }
 
-function over18() {
+declare global {
+  interface Window { over18: () => void; }
+}
+
+window.over18 = () => {
   document.getElementById("overlay_over18").style.display = 'none';
   isScreened = true;
   window.localStorage['over18'] = true;
@@ -71,5 +75,5 @@ if (params["source"] && params["source"] === "android") {
 }
 
 if (isScreened || window.localStorage['over18']) {
-  over18();
+  window.over18();
 }