diff --git a/lib/ext/Syncroton/Server.php b/lib/ext/Syncroton/Server.php
--- a/lib/ext/Syncroton/Server.php
+++ b/lib/ext/Syncroton/Server.php
@@ -254,10 +254,13 @@
     {
         $loops = 0;
         
-        $tempStream = fopen('php://temp/maxmemory:5242880', 'r+');
-                
+        $tempStream = tmpfile();
+
+        $meta_data = stream_get_meta_data($tempStream);
+        $filename = $meta_data["uri"];
+        
         $dom->formatOutput = true;
-        fwrite($tempStream, $dom->saveXML());
+        $dom->save($filename);
         $dom->formatOutput = false;
         
         rewind($tempStream);
diff --git a/lib/ext/Syncroton/Wbxml/Encoder.php b/lib/ext/Syncroton/Wbxml/Encoder.php
--- a/lib/ext/Syncroton/Wbxml/Encoder.php
+++ b/lib/ext/Syncroton/Wbxml/Encoder.php
@@ -151,8 +151,11 @@
     {
         $_dom->formatOutput = false;
         
-        $tempStream = fopen('php://temp/maxmemory:5242880', 'r+');
-        fwrite($tempStream, $_dom->saveXML());
+        $tempStream = tmpfile();
+
+        $meta_data = stream_get_meta_data($tempStream);
+        $filename = $meta_data["uri"];
+        $_dom->save($filename);
         rewind($tempStream);
         
         $this->_initialize($_dom);