diff --git a/xmlrpc.php b/xmlrpc.php
index 60f2a2c25f..2b7df24610 100644
--- a/xmlrpc.php
+++ b/xmlrpc.php
@@ -5,6 +5,12 @@ define('XMLRPC_REQUEST', true);
 // Some browser-embedded clients send cookies. We don't want them.
 $_COOKIE = array();
 
+// A bug in PHP < 5.2.2 makes $HTTP_RAW_POST_DATA not set by default, 
+// but we can do it ourself.
+if ( !isset( $HTTP_RAW_POST_DATA ) ) {
+	$HTTP_RAW_POST_DATA = file_get_contents( 'php://input' );
+}
+
 # fix for mozBlog and other cases where '<?xml' isn't on the very first line
 if ( isset($HTTP_RAW_POST_DATA) )
 	$HTTP_RAW_POST_DATA = trim($HTTP_RAW_POST_DATA);