diff --git a/java/com/google/gerrit/pgm/http/jetty/ProjectQoSFilter.java b/java/com/google/gerrit/pgm/http/jetty/ProjectQoSFilter.java
index 35beaeb60a..260f695a6e 100644
--- a/java/com/google/gerrit/pgm/http/jetty/ProjectQoSFilter.java
+++ b/java/com/google/gerrit/pgm/http/jetty/ProjectQoSFilter.java
@@ -148,7 +148,7 @@ public class ProjectQoSFilter implements Filter {
   @Override
   public void destroy() {}
 
-  private final class Listener implements ContinuationListener {
+  private static final class Listener implements ContinuationListener {
     final Future<?> future;
 
     Listener(Future<?> future) {