diff --git a/benchmarkapps/PlatformBenchmarks/DateHeader.cs b/benchmarkapps/PlatformBenchmarks/DateHeader.cs
index 1d03d78b53..5cfbc5c3b2 100644
--- a/benchmarkapps/PlatformBenchmarks/DateHeader.cs
+++ b/benchmarkapps/PlatformBenchmarks/DateHeader.cs
@@ -45,7 +45,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http
         {
             lock (s_headerBytesScratch)
             {
-                if (!Utf8Formatter.TryFormat(value, s_headerBytesScratch.AsSpan().Slice(prefixLength), out int written, 'R'))
+                if (!Utf8Formatter.TryFormat(value, s_headerBytesScratch.AsSpan(prefixLength), out int written, 'R'))
                 {
                     throw new Exception("date time format failed");
                 }