diff --git a/umap/static/umap/js/modules/sync/engine.js b/umap/static/umap/js/modules/sync/engine.js
index caa36058..651825ce 100644
--- a/umap/static/umap/js/modules/sync/engine.js
+++ b/umap/static/umap/js/modules/sync/engine.js
@@ -183,9 +183,13 @@ export class SyncEngine {
    * @param {string} payload.sender the uuid of the requesting peer
    * @param {string} payload.latestKnownHLC the latest known HLC of the requesting peer
    */
-  onListOperationsRequest({ sender, lastKnownHLC }) {
+  onListOperationsRequest({ sender, message }) {
+    debug(
+      `received operations request from peer ${sender} (since ${message.lastKnownHLC})`
+    )
+
     this.sendToPeer(sender, 'ListOperationsResponse', {
-      operations: this._operations.getOperationsSince(lastKnownHLC),
+      operations: this._operations.getOperationsSince(message.lastKnownHLC),
     })
   }