diff --git a/modules/swagger-codegen/src/main/resources/typescript-angular2/configuration.mustache b/modules/swagger-codegen/src/main/resources/typescript-angular2/configuration.mustache
index 0eed43fd575..2b53f0a6420 100644
--- a/modules/swagger-codegen/src/main/resources/typescript-angular2/configuration.mustache
+++ b/modules/swagger-codegen/src/main/resources/typescript-angular2/configuration.mustache
@@ -8,12 +8,12 @@ export interface ConfigurationParameters {
 }
 
 export class Configuration {
-    apiKeys: {[ key: string ]: string};
-    username: string;
-    password: string;
-    accessToken: string | (() => string);
-    basePath: string;
-    withCredentials: boolean;
+    apiKeys?: {[ key: string ]: string};
+    username?: string;
+    password?: string;
+    accessToken?: string | (() => string);
+    basePath?: string;
+    withCredentials?: boolean;
 
     constructor(configurationParameters: ConfigurationParameters = {}) {
         this.apiKeys = configurationParameters.apiKeys;