diff --git a/AjaxControlToolkit/AjaxFileUpload/AjaxFileUpload.cs b/AjaxControlToolkit/AjaxFileUpload/AjaxFileUpload.cs
index b9368da92..8aa4c4651 100644
--- a/AjaxControlToolkit/AjaxFileUpload/AjaxFileUpload.cs
+++ b/AjaxControlToolkit/AjaxFileUpload/AjaxFileUpload.cs
@@ -389,7 +389,7 @@ public static string BuildTempFolder(string fileId) {
         }
 
         public static string BuildRootTempFolder() {
-            var rootTempFolder = Path.Combine(Path.GetTempPath(), TemporaryUploadFolderName);
+            var rootTempFolder = Path.Combine(AjaxFileUploadHelper.RootTempFolderPath, TemporaryUploadFolderName);
             if(!Directory.Exists(rootTempFolder))
                 Directory.CreateDirectory(rootTempFolder);
 
diff --git a/AjaxControlToolkit/AjaxFileUpload/AjaxFileUploadHelper.cs b/AjaxControlToolkit/AjaxFileUpload/AjaxFileUploadHelper.cs
index fe6fd7806..676fcf0b3 100644
--- a/AjaxControlToolkit/AjaxFileUpload/AjaxFileUploadHelper.cs
+++ b/AjaxControlToolkit/AjaxFileUpload/AjaxFileUploadHelper.cs
@@ -12,6 +12,13 @@ public static class AjaxFileUploadHelper {
         const int ChunkSize = 1024 * 1024 * 4;
         const int ChunkSizeForPolling = 64 * 1024;
 
+        public static string RootTempFolderPath { get; set; }
+
+        static AjaxFileUploadHelper()
+        {
+            RootTempFolderPath = Path.GetTempPath();
+        }
+
         public static void Abort(HttpContext context, string fileId) {
             (new AjaxFileUploadStates(context, fileId)).Abort = true;
         }