diff --git a/server/TracyWorker.cpp b/server/TracyWorker.cpp
index b86d1739..a79e8d96 100644
--- a/server/TracyWorker.cpp
+++ b/server/TracyWorker.cpp
@@ -8240,7 +8240,7 @@ void Worker::Write( FileWrite& f, bool fiDict )
     f.Write( &sz, sizeof( sz ) );
     for( size_t i=1; i<=sz; i++ )
     {
-        auto cs = m_data.callstackPayload[i];
+        auto& cs = m_data.callstackPayload[i];
         uint16_t csz = cs->size();
         f.Write( &csz, sizeof( csz ) );
         f.Write( cs->data(), sizeof( CallstackFrameId ) * csz );