diff --git a/src/BenchmarkDotNet.Core/Engines/Engine.cs b/src/BenchmarkDotNet.Core/Engines/Engine.cs
index eebabbfcba..3b84b84cd7 100644
--- a/src/BenchmarkDotNet.Core/Engines/Engine.cs
+++ b/src/BenchmarkDotNet.Core/Engines/Engine.cs
@@ -120,8 +120,8 @@ public RunResults Run()
 
             // we enable monitoring after pilot & warmup, just to ignore the memory allocated by these runs
             EnableMonitoring();
-            var initialGcStats = GcStats.ReadInitial(IsDiagnoserAttached);
             if(IsDiagnoserAttached) Host.BeforeMainRun();
+            var initialGcStats = GcStats.ReadInitial(IsDiagnoserAttached);
 
             var main = targetStage.RunMain(invokeCount, UnrollFactor, forceSpecific: Strategy == RunStrategy.Monitoring);