diff --git a/include/diaspora.php b/include/diaspora.php
index 277eb6f8e8..d2a90fc983 100644
--- a/include/diaspora.php
+++ b/include/diaspora.php
@@ -118,7 +118,7 @@ class diaspora {
 	 *
 	 * @return string the repaired signature
 	 */
-	function repair_signature($signature, $handle = "", $level = 1) {
+	private function repair_signature($signature, $handle = "", $level = 1) {
 
 		if ($signature == "")
 			return ($signature);
@@ -146,7 +146,7 @@ class diaspora {
 	 * 'author' -> author diaspora handle
 	 * 'key' -> author public key (converted to pkcs#8)
 	 */
-	function decode($importer, $xml) {
+	public static function decode($importer, $xml) {
 
 		$public = false;
 		$basedom = parse_xml_string($xml);
diff --git a/include/xml.php b/include/xml.php
index 47a2f6f7d5..2bcc73b8f7 100644
--- a/include/xml.php
+++ b/include/xml.php
@@ -15,7 +15,7 @@ class xml {
 	 *
 	 * @return string The created XML
 	 */
-	function from_array($array, &$xml, $remove_header = false, $namespaces = array(), $root = true) {
+	public static function from_array($array, &$xml, $remove_header = false, $namespaces = array(), $root = true) {
 
 		if ($root) {
 			foreach($array as $key => $value) {
@@ -78,7 +78,7 @@ class xml {
 	 * @param object $target The XML target
 	 * @param string $elementname Name of the XML element of the target
 	 */
-	function copy(&$source, &$target, $elementname) {
+	public static function copy(&$source, &$target, $elementname) {
 		if (count($source->children()) == 0)
 			$target->addChild($elementname, xmlify($source));
 		else {