diff --git a/types/zetapush-js/index.d.ts b/types/zetapush-js/index.d.ts
index afe0e3c6b0..b6d8d1d9e3 100644
--- a/types/zetapush-js/index.d.ts
+++ b/types/zetapush-js/index.d.ts
@@ -120,10 +120,10 @@ export interface ClientHelper {
 
 export type ConnectionStatusHandler = number;
 
-export class Authentication {
-  static delegating({ token }: TokenAuthData): TokenHandshake;
-  static simple({ login, password }: CredentialsAuthData): CredentialsHandshake;
-  static weak({ token }: TokenAuthData): TokenHandshake;
+export namespace Authentication {
+  function delegating({ token }: TokenAuthData): TokenHandshake;
+  function simple({ login, password }: CredentialsAuthData): CredentialsHandshake;
+  function weak({ token }: TokenAuthData): TokenHandshake;
 }
 
 export interface ConnectionStatusListener {