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
@@ -123,8 +123,7 @@
                 $decoder = new Syncroton_Wbxml_Decoder($this->_body);
                 $requestBody = $decoder->decode();
                 if ($this->_logger instanceof Zend_Log) {
-                    $requestBody->formatOutput = true;
-                    $this->_logger->debug(__METHOD__ . '::' . __LINE__ . " xml request:\n" . $requestBody->saveXML());
+                    $this->_logDomDocument($requestBody, 'request', __METHOD__, __LINE__);
                 }
             } catch(Syncroton_Wbxml_Exception_UnexpectedEndOfFile $e) {
                 if ($this->_logger instanceof Zend_Log)
@@ -176,7 +175,7 @@
         
         if ($response instanceof DOMDocument) {
             if ($this->_logger instanceof Zend_Log) {
-                $this->_logDomDocument(Zend_Log::DEBUG, $response, __METHOD__, __LINE__);
+                $this->_logDomDocument($response, 'response', __METHOD__, __LINE__);
             }
             
             if (isset($command) && $command instanceof Syncroton_Command_ICommand) {
@@ -246,13 +245,17 @@
     /**
      * write (possible big) DOMDocument in smaller chunks to log file
      * 
-     * @param int         $priority
      * @param DOMDocument $dom
+     * @param string      $action
      * @param string      $method
      * @param int         $line
      */
-    protected function _logDomDocument($priority, DOMDocument $dom, $method, $line)
+    protected function _logDomDocument(DOMDocument $dom, $action, $method, $line)
     {
+        if (method_exists($this->_logger, 'hasDebug') && !$this->_logger->hasDebug()) {
+            return;
+        }
+
         $tempStream = tmpfile();
 
         $meta_data = stream_get_meta_data($tempStream);
@@ -266,7 +269,7 @@
 
         $loops = 0;
         while (!feof($tempStream)) {
-            $this->_logger->log($method . '::' . $line . " xml response($loops):\n" . fread($tempStream, 1048576), $priority);
+            $this->_logger->debug("{$method}::{$line} xml {$action} ({$loops}):\n" . fread($tempStream, 1048576));
             $loops++;
         }
         
diff --git a/lib/kolab_sync_logger.php b/lib/kolab_sync_logger.php
--- a/lib/kolab_sync_logger.php
+++ b/lib/kolab_sync_logger.php
@@ -59,6 +59,17 @@
     }
 
     /**
+     * Check whether debug logging is enabled
+     *
+     * @return bool
+     */
+    public function hasDebug()
+    {
+        // This is what we check in self::log() below
+        return !empty($this->log_dir) && $this->mode >= self::NOTICE;
+    }
+
+    /**
      * Message logger
      *
      * @param string     $message Log message