Code cleanup, no functional changes

1 files changed, 1 insertions, 1 deletions

diff --git a/clustercontroller-utils/src/main/java/com/yahoo/vespa/clustercontroller/utils/communication/async/AsyncOperationListenImpl.java b/clustercontroller-utils/src/main/java/com/yahoo/vespa/clustercontroller/utils/communication/async/AsyncOperationListenImpl.java
index 2964c81df5e..a2a73e87537 100644
--- a/clustercontroller-utils/src/main/java/com/yahoo/vespa/clustercontroller/utils/communication/async/AsyncOperationListenImpl.java
+++ b/clustercontroller-utils/src/main/java/com/yahoo/vespa/clustercontroller/utils/communication/async/AsyncOperationListenImpl.java
@@ -12,7 +12,7 @@ public class AsyncOperationListenImpl<T> {
     private static final Logger log = Logger.getLogger(AsyncOperationListenImpl.class.getName());
     private final Collection<AsyncCallback<T>> listeners = new HashSet<>();
     private boolean listenersNotified = false;
-    private AsyncOperation<T> op;
+    private final AsyncOperation<T> op;
 
     protected AsyncOperationListenImpl(AsyncOperation<T> op) {
         this.op = op;