diff --git a/docs/en/Background-Workers.md b/docs/en/Background-Workers.md
index 8225aac2a6..b12f1881fb 100644
--- a/docs/en/Background-Workers.md
+++ b/docs/en/Background-Workers.md
@@ -45,7 +45,7 @@ Assume that we want to make a user passive, if the user has not logged in to the
 public class PassiveUserCheckerWorker : AsyncPeriodicBackgroundWorkerBase
 {
     public PassiveUserCheckerWorker(
-            AbpTimer timer,
+            AbpAsyncTimer timer,
             IServiceScopeFactory serviceScopeFactory
         ) : base(
             timer,