diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/scheduler/QueueScheduler.java b/webmagic-core/src/main/java/us/codecraft/webmagic/scheduler/QueueScheduler.java
index c38311f2..078506c6 100644
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/scheduler/QueueScheduler.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/scheduler/QueueScheduler.java
@@ -26,7 +26,7 @@ public class QueueScheduler extends DuplicateRemovedScheduler implements Monitor
     }
 
     @Override
-    public synchronized Request poll(Task task) {
+    public Request poll(Task task) {
         return queue.poll();
     }