diff --git a/Trigger/TrigMonitoring/TrigCostMonitor/src/TrigCostSvc.cxx b/Trigger/TrigMonitoring/TrigCostMonitor/src/TrigCostSvc.cxx
index 300401a9fb8e76fec0c57617447063423d52ede4..6a60514b1dab6c24ec049bbe02d5579e954835cd 100644
--- a/Trigger/TrigMonitoring/TrigCostMonitor/src/TrigCostSvc.cxx
+++ b/Trigger/TrigMonitoring/TrigCostMonitor/src/TrigCostSvc.cxx
@@ -459,7 +459,7 @@ StatusCode TrigCostSvc::generateTimeoutReport(const EventContext& context, std::
   int algCounter = 0;
   for(const std::pair<const uint64_t, std::string>& p : timeToAlgMap){
     // Save time in miliseconds instead of microseconds
-    report += p.second + " (" + std::to_string(std::round(p.first/3.)) + " ms)";
+    report += p.second + " (" + std::to_string(std::lround(p.first/1e3)) + " ms)";
     ++algCounter;
     if (algCounter >= 5){
       break;