diff --git a/lib/htmlpurifier/locallib.php b/lib/htmlpurifier/locallib.php
index 66e4e97ef0e..b949b7404fc 100644
--- a/lib/htmlpurifier/locallib.php
+++ b/lib/htmlpurifier/locallib.php
@@ -41,6 +41,22 @@ class HTMLPurifier_URIScheme_rtsp extends HTMLPurifier_URIScheme {
 }
 
 
+/**
+ * Validates RTMP defined by Adobe
+ */
+class HTMLPurifier_URIScheme_rtmp extends HTMLPurifier_URIScheme {
+
+    public $browsable = false;
+    public $hierarchical = true;
+
+    public function doValidate(&$uri, $config, $context) {
+        $uri->userinfo = null;
+        return true;
+    }
+
+}
+
+
 /**
  * Validates IRC defined by IETF Draft
  */
diff --git a/lib/tests/htmlpurifier_test.php b/lib/tests/htmlpurifier_test.php
index 88a16440ae1..51d22c83b34 100644
--- a/lib/tests/htmlpurifier_test.php
+++ b/lib/tests/htmlpurifier_test.php
@@ -295,6 +295,9 @@ class core_htmlpurifier_testcase extends basic_testcase {
         $text = '<a href="rtsp://www.example.com/movie.mov">link</a>';
         $this->assertSame($text, purify_html($text));
 
+        $text = '<a href="rtmp://www.example.com/video.f4v">link</a>';
+        $this->assertSame($text, purify_html($text));
+
         $text = '<a href="teamspeak://speak.example.com/?par=val?par2=val2">link</a>';
         $this->assertSame($text, purify_html($text));
 
diff --git a/lib/weblib.php b/lib/weblib.php
index 55ae5f77452..c082abb2487 100644
--- a/lib/weblib.php
+++ b/lib/weblib.php
@@ -1680,6 +1680,7 @@ function purify_html($text, $options = array()) {
             'nntp' => true,
             'news' => true,
             'rtsp' => true,
+            'rtmp' => true,
             'teamspeak' => true,
             'gopher' => true,
             'mms' => true,