diff --git a/server/TracyView.cpp b/server/TracyView.cpp
index 59a3760d..d07ff93a 100644
--- a/server/TracyView.cpp
+++ b/server/TracyView.cpp
@@ -1998,7 +1998,8 @@ void View::DrawZones()
 
 int View::DrawZoneLevel( const Vector<ZoneEvent*>& vec, bool hover, double pxns, const ImVec2& wpos, int _offset, int depth )
 {
-    auto it = std::lower_bound( vec.begin(), vec.end(), m_zvStart - m_delay, [] ( const auto& l, const auto& r ) { return l->end < r; } );
+    // cast to uint64_t, so that unended zones (end = -1) are still drawn
+    auto it = std::lower_bound( vec.begin(), vec.end(), m_zvStart - m_delay, [] ( const auto& l, const auto& r ) { return (uint64_t)l->end < (uint64_t)r; } );
     if( it == vec.end() ) return depth;
 
     const auto zitend = std::lower_bound( vec.begin(), vec.end(), m_zvEnd + m_resolution, [] ( const auto& l, const auto& r ) { return l->start < r; } );