diff --git a/server/TracyView.cpp b/server/TracyView.cpp
index 5b6348e1..9d936099 100755
--- a/server/TracyView.cpp
+++ b/server/TracyView.cpp
@@ -1652,7 +1652,7 @@ void View::WriteTimeline( FileWrite& f, const Vector<Event*>& vec )
     }
 }
 
-void View::ReadTimeline( FileRead& f, Vector<Event*>& vec, Event* parent, const std::unordered_map<uint64_t, const char*> stringMap )
+void View::ReadTimeline( FileRead& f, Vector<Event*>& vec, Event* parent, const std::unordered_map<uint64_t, const char*>& stringMap )
 {
     uint64_t sz;
     f.Read( &sz, sizeof( sz ) );
diff --git a/server/TracyView.hpp b/server/TracyView.hpp
index 0532f8f5..68e4c41f 100755
--- a/server/TracyView.hpp
+++ b/server/TracyView.hpp
@@ -98,7 +98,7 @@ private:
 
     void Write( FileWrite& f );
     void WriteTimeline( FileWrite& f, const Vector<Event*>& vec );
-    void ReadTimeline( FileRead& f, Vector<Event*>& vec, Event* parent, const std::unordered_map<uint64_t, const char*> stringMap );
+    void ReadTimeline( FileRead& f, Vector<Event*>& vec, Event* parent, const std::unordered_map<uint64_t, const char*>& stringMap );
 
     std::string m_addr;