diff --git a/xds/src/main/java/io/grpc/xds/XdsDependencyManager.java b/xds/src/main/java/io/grpc/xds/XdsDependencyManager.java
index 78d4dbb198..c0054c1633 100644
--- a/xds/src/main/java/io/grpc/xds/XdsDependencyManager.java
+++ b/xds/src/main/java/io/grpc/xds/XdsDependencyManager.java
@@ -525,6 +525,7 @@ final class XdsDependencyManager implements XdsConfig.XdsClusterSubscriptionRegi
     }
 
     public void close() {
+      cancelled = true;
       xdsClient.cancelXdsResourceWatch(type, resourceName, this);
     }