diff --git a/remoting/src/main/java/hudson/remoting/Request.java b/remoting/src/main/java/hudson/remoting/Request.java
index 17e7f866da8355b1f07e0ec32a88514b98d184d8..c1850baca80295a6d2d8b39acb4239a7d1cef501 100644
--- a/remoting/src/main/java/hudson/remoting/Request.java
+++ b/remoting/src/main/java/hudson/remoting/Request.java
@@ -171,7 +171,7 @@ abstract class Request<RSP extends Serializable,EXC extends Throwable> extends C
 
         return new hudson.remoting.Future<RSP>() {
 
-            private boolean cancelled;
+            private volatile boolean cancelled;
 
             public boolean cancel(boolean mayInterruptIfRunning) {
                 if (cancelled || isDone()) {