diff --git a/api/service.ts b/api/service.ts
index 41d0e7d..834af89 100644
--- a/api/service.ts
+++ b/api/service.ts
@@ -125,7 +125,7 @@ export class WorkflowService {
       sub: "urn:deco:service::workflows",
       aud: `urn:deco:site::${namespace}:`,
       iat,
-      exp: iat + 600, // ten minutes duration
+      exp: iat + 600_000, // ten minutes duration
     });
   }