diff --git a/cordova-plugin-ms-adal/cordova-plugin-ms-adal.d.ts b/cordova-plugin-ms-adal/cordova-plugin-ms-adal.d.ts
index 10ebdda79f..407de6347a 100644
--- a/cordova-plugin-ms-adal/cordova-plugin-ms-adal.d.ts
+++ b/cordova-plugin-ms-adal/cordova-plugin-ms-adal.d.ts
@@ -92,7 +92,7 @@ declare namespace Microsoft {
             then(doneCallBack: (context: AuthenticationContext) => any, failCallBack?: (message: string) => any):any;
         }
 
-        class AuthenticationContext implements AuthenticationContext {
+        class AuthenticationContext {
             authority: string;
             validateAuthority: boolean;
             tokenCache: TokenCache;