diff --git a/src/auth/computeclient.ts b/src/auth/computeclient.ts
index f4bc7a8f..29fabd16 100644
--- a/src/auth/computeclient.ts
+++ b/src/auth/computeclient.ts
@@ -33,7 +33,7 @@ export interface ComputeOptions extends RefreshOptions {
 }
 
 export class Compute extends OAuth2Client {
-  private serviceAccountEmail: string;
+  readonly serviceAccountEmail: string;
   scopes: string[];
 
   /**