diff --git a/server/TracyEvent.hpp b/server/TracyEvent.hpp
index c03cfa63..0b65bd6d 100644
--- a/server/TracyEvent.hpp
+++ b/server/TracyEvent.hpp
@@ -80,6 +80,7 @@ struct ZoneEvent
     int8_t cpu_start;
     int8_t cpu_end;
     StringIdx text;
+    uint32_t callstack;
 
     // This must be last. All above is read/saved as-is.
     Vector<ZoneEvent*> child;
diff --git a/server/TracyWorker.cpp b/server/TracyWorker.cpp
index dc3ac5c2..85861661 100644
--- a/server/TracyWorker.cpp
+++ b/server/TracyWorker.cpp
@@ -1597,6 +1597,7 @@ void Worker::ProcessZoneBeginImpl( ZoneEvent* zone, const QueueZoneBegin& ev )
     zone->srcloc = ShrinkSourceLocation( ev.srcloc );
     assert( ev.cpu == 0xFFFFFFFF || ev.cpu <= std::numeric_limits<int8_t>::max() );
     zone->cpu_start = ev.cpu == 0xFFFFFFFF ? -1 : (int8_t)ev.cpu;
+    zone->callstack = 0;
 
     m_data.lastTime = std::max( m_data.lastTime, zone->start );
 
@@ -1631,6 +1632,7 @@ void Worker::ProcessZoneBeginAllocSrcLoc( const QueueZoneBegin& ev )
     zone->srcloc = it->second;
     assert( ev.cpu == 0xFFFFFFFF || ev.cpu <= std::numeric_limits<int8_t>::max() );
     zone->cpu_start = ev.cpu == 0xFFFFFFFF ? -1 : (int8_t)ev.cpu;
+    zone->callstack = 0;
 
     m_data.lastTime = std::max( m_data.lastTime, zone->start );