diff --git a/packages/repl/src/components/editor/utils/setup.ts b/packages/repl/src/components/editor/utils/setup.ts
index 1d84e81..d8fcaf6 100644
--- a/packages/repl/src/components/editor/utils/setup.ts
+++ b/packages/repl/src/components/editor/utils/setup.ts
@@ -79,7 +79,9 @@ export async function setupMonaco() {
   })
 
   extraLibs.push({
-    content: 'declare const tg: import("@mtcute/web").TelegramClient',
+    content:
+      'declare const tg: import("@mtcute/web").TelegramClient;\n'
+      + 'declare const Long: import("@mtcute/web").Long;',
     filePath: 'file:///tg.d.ts',
   })
 
diff --git a/packages/worker/src/sw/iframe/script.ts b/packages/worker/src/sw/iframe/script.ts
index 17794b7..edd1966 100644
--- a/packages/worker/src/sw/iframe/script.ts
+++ b/packages/worker/src/sw/iframe/script.ts
@@ -13,6 +13,8 @@ declare const window: typeof globalThis & {
   tg: import('@mtcute/web').TelegramClient
 }
 
+Object.defineProperty(globalThis, 'Long', { value: Long })
+
 function sendToDevtools(message: any) {
   window.parent.postMessage({ event: 'TO_DEVTOOLS', value: message }, HOST_ORIGIN)
 }