diff --git a/packages/core/types/zapier.custom.d.ts b/packages/core/types/zapier.custom.d.ts
index fe23f4e89..1e47b5c8d 100644
--- a/packages/core/types/zapier.custom.d.ts
+++ b/packages/core/types/zapier.custom.d.ts
@@ -213,7 +213,7 @@ export interface ZObject {
 
   cache: {
     get: (key: string) => Promise<any>;
-    set: (key: string, value: any, ttl?: number) => Promise<boolean>;
+    set: (key: string, value: any, ttl?: number, nx?: boolean) => Promise<boolean|null>;
     delete: (key: string) => Promise<boolean>;
   };
 }