diff --git a/nanoFramework.System.Net.Http/Http/Headers/HttpHeaders.cs b/nanoFramework.System.Net.Http/Http/Headers/HttpHeaders.cs
index 5bc064ed..920ed72d 100644
--- a/nanoFramework.System.Net.Http/Http/Headers/HttpHeaders.cs
+++ b/nanoFramework.System.Net.Http/Http/Headers/HttpHeaders.cs
@@ -30,7 +30,7 @@ public HeaderEntry(
     /// </summary>
     public abstract class HttpHeaders
     {
-        internal WebHeaderCollection _headerStore = new WebHeaderCollection(true);
+        internal WebHeaderCollection _headerStore = new WebHeaderCollection(false);
 
         private readonly HttpHeaderType _allowedHeaderTypes;
         private readonly HttpHeaderType _treatAsCustomHeaderTypes;