diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java b/webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java
index a35af70a..e47a61f2 100644
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java
@@ -187,7 +187,7 @@ public class Spider implements Runnable, Task {
      */
     public Spider setScheduler(Scheduler updateScheduler) {
         checkIfRunning();
-        SpiderScheduler oldScheduler = this.scheduler;
+        Scheduler oldScheduler = scheduler.getScheduler();
         scheduler.setScheduler(updateScheduler);
         if (oldScheduler != null) {
             Request request;