diff --git a/packages/core/src/core.ts b/packages/core/src/core.ts
index 0aa287ce..4b594b83 100644
--- a/packages/core/src/core.ts
+++ b/packages/core/src/core.ts
@@ -351,6 +351,6 @@ export function getState(name: string): string {
   return process.env[`STATE_${name}`] || ''
 }
 
-export async function getIDToken(aud: string): Promise<string> {
+export async function getIDToken(aud = undefined): Promise<string> {
   return await OidcClient.getIDToken(aud)
 }
\ No newline at end of file
diff --git a/packages/core/src/oidc-utils.ts b/packages/core/src/oidc-utils.ts
index 1eff1f2c..46b0416f 100644
--- a/packages/core/src/oidc-utils.ts
+++ b/packages/core/src/oidc-utils.ts
@@ -45,12 +45,7 @@ export class OidcClient {
     return runtimeUrl + '?api-version=' + OidcClient.getApiVersion()
   }
 
-  private static async postCall(httpclient: actions_http_client.HttpClient, id_token_url: string, audience: string): Promise<string> {
-
-    const data: TokenRequest = { aud: audience }
-
-    debug(`audience is ${!!audience ? audience : 'not defined'}`)
-
+  private static async postCall(httpclient: actions_http_client.HttpClient, id_token_url: string, data: TokenRequest): Promise<string> {
     const res = await httpclient.postJson<TokenResponse>(id_token_url,data).catch((error) => {
       throw new Error(
         `Failed to get ID Token. \n 
@@ -67,7 +62,7 @@ export class OidcClient {
 
   }
 
-  static async getIDToken(audience: string): Promise<string> {
+  static async getIDToken(audience: string | undefined): Promise<string> {
     try {
       const httpclient = OidcClient.createHttpClient()
 
@@ -76,7 +71,11 @@ export class OidcClient {
 
       debug(`ID token url is ${id_token_url}`)
 
-      const id_token = await OidcClient.postCall(httpclient ,id_token_url, audience)
+      const data: TokenRequest = { aud: audience }
+
+      debug(`audience is ${!!audience ? audience : 'not defined'}`)
+
+      const id_token = await OidcClient.postCall(httpclient ,id_token_url, data)
       setSecret(id_token)
       return id_token
     } catch (error) {