diff --git a/sdk/src/Services/S3/Custom/Transfer/Internal/FilePartDataHandler.cs b/sdk/src/Services/S3/Custom/Transfer/Internal/FilePartDataHandler.cs
index 986cffbe7670..d85556a34ecc 100644
--- a/sdk/src/Services/S3/Custom/Transfer/Internal/FilePartDataHandler.cs
+++ b/sdk/src/Services/S3/Custom/Transfer/Internal/FilePartDataHandler.cs
@@ -209,8 +209,7 @@ private async Task WritePartToFileAsync(
                 FileMode.Open,          // Open existing file
                 FileAccess.Write,
                 FileShare.Write,        // Allow concurrent writes to different offsets
-                _config.BufferSize,
-                FileOptions.Asynchronous))
+                _config.BufferSize))
             {
                 // Seek to the correct offset for this part
                 fileStream.Seek(offset, SeekOrigin.Begin);