diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/extensions/events/GitReferenceUpdated.java b/gerrit-server/src/main/java/com/google/gerrit/server/extensions/events/GitReferenceUpdated.java
index 386bcea76a..eb179161cb 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/extensions/events/GitReferenceUpdated.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/extensions/events/GitReferenceUpdated.java
@@ -63,7 +63,7 @@ public class GitReferenceUpdated {
         Account.Id updater) {}
   };
 
-  private final Iterable<GitReferenceUpdatedListener> listeners;
+  private final DynamicSet<GitReferenceUpdatedListener> listeners;
   private final EventUtil util;
 
   @Inject