diff --git a/interface/src/Application.cpp b/interface/src/Application.cpp
index 7333960689..6d6c7d64ab 100644
--- a/interface/src/Application.cpp
+++ b/interface/src/Application.cpp
@@ -2120,6 +2120,8 @@ void Application::sendNack() {
             || node->getType() == NodeType::ModelServer)
             ) {
 
+            _octreeSceneStatsLock.lockForWrite();
+
             OctreeSceneStats& stats = _octreeServerSceneStats[node->getUUID()];
 
             char* dataAt = packet;
@@ -2146,6 +2148,8 @@ void Application::sendNack() {
                 dataAt += sizeof(OCTREE_PACKET_SEQUENCE);
             }
 
+            _octreeSceneStatsLock.unlock();
+
             // make sure we still have an active socket????
             nodeList->writeUnverifiedDatagram(packet, dataAt - packet, node);
         }