diff --git a/src/OpenTelemetry.Instrumentation.Http/Implementation/HttpWebRequestActivitySource.netfx.cs b/src/OpenTelemetry.Instrumentation.Http/Implementation/HttpWebRequestActivitySource.netfx.cs
index b6d48dc9f93..5c0e573a127 100644
--- a/src/OpenTelemetry.Instrumentation.Http/Implementation/HttpWebRequestActivitySource.netfx.cs
+++ b/src/OpenTelemetry.Instrumentation.Http/Implementation/HttpWebRequestActivitySource.netfx.cs
@@ -353,7 +353,7 @@ private static void HookOrProcessResult(HttpWebRequest request)
         if (endCalledAccessor.Invoke(readAsyncContext) || readAsyncContext.CompletedSynchronously)
         {
             // We need to process the result directly because the read callback has already fired. Force a copy because response has likely already been disposed.
-            ProcessResult(readAsyncContext, null, writeAsyncContextCallback.Activity, resultAccessor(readAsyncContext), true, request, -1);
+            ProcessResult(readAsyncContext, null, writeAsyncContextCallback.Activity, resultAccessor(readAsyncContext), true, request, writeAsyncContextCallback.StartTimestamp);
             return;
         }