diff --git a/packages/core/src/base-client.ts b/packages/core/src/base-client.ts
index 86ea28ba..a357ae29 100644
--- a/packages/core/src/base-client.ts
+++ b/packages/core/src/base-client.ts
@@ -93,12 +93,6 @@ export class BaseTelegramClient extends EventEmitter {
     constructor(opts: BaseTelegramClientOptions) {
         super()
 
-        const apiId = typeof opts.apiId === 'string' ? parseInt(opts.apiId) : opts.apiId
-
-        if (isNaN(apiId)) {
-            throw new Error('apiId must be a number or a numeric string!')
-        }
-
         if (opts.logLevel !== undefined) {
             this.log.level = opts.logLevel
         }
@@ -129,7 +123,7 @@ export class BaseTelegramClient extends EventEmitter {
 
         this.network = new NetworkManager(
             {
-                apiId,
+                apiId: opts.apiId,
                 crypto: this.crypto,
                 disableUpdates: opts.disableUpdates ?? false,
                 initConnectionOptions: opts.initConnectionOptions,
diff --git a/packages/core/src/base-client.types.ts b/packages/core/src/base-client.types.ts
index e42b8334..bbc0e8fa 100644
--- a/packages/core/src/base-client.types.ts
+++ b/packages/core/src/base-client.types.ts
@@ -11,7 +11,7 @@ export interface BaseTelegramClientOptions {
     /**
      * API ID from my.telegram.org
      */
-    apiId: number | string
+    apiId: number
     /**
      * API hash from my.telegram.org
      */