diff --git a/src/ClamAV/ClamAV.php b/src/ClamAV/ClamAV.php
index 83630ac..3f1efc3 100644
--- a/src/ClamAV/ClamAV.php
+++ b/src/ClamAV/ClamAV.php
@@ -105,8 +105,9 @@ public function fileScanInStream(string $file): bool
 
         while (!\feof($handle)) {
             $data = \fread($handle, $chunkSize);
-            $packet = \pack(\sprintf("Na%d", $chunkSize), $chunkSize, $data);
-            \socket_send($socket, $packet, $chunkSize + 4, 0);
+            $length = pack("N", strlen($data));
+            socket_write($socket, $length, 4);
+            socket_write($socket, $data, strlen($data));
         }
 
         \socket_send($socket, \pack("Nx", 0), 5, 0);