diff --git a/slixmpp/plugins/xep_0402/stanza.py b/slixmpp/plugins/xep_0402/stanza.py
index 896ff863..32691202 100644
--- a/slixmpp/plugins/xep_0402/stanza.py
+++ b/slixmpp/plugins/xep_0402/stanza.py
@@ -9,18 +9,25 @@ class Conference(ElementBase):
     namespace = NS
     name = "conference"
     plugin_attrib = "conference"
-    interfaces = {"name", "autojoin", "nick"}
-    sub_interfaces = {"nick"}
+    interfaces = {"name", "autojoin", "nick", "password"}
+    sub_interfaces = {"nick", "password"}
 
     def set_autojoin(self, v: bool):
-        self._set_attr('autojoin', "true" if v else "false")
+        self._set_attr("autojoin", "true" if v else "false")
 
     def get_autojoin(self):
-        v = self._get_attr('autojoin', '')
+        v = self._get_attr("autojoin", "")
         if not v:
             return False
         return v == "1" or v.lower() == "true"
 
 
+class Extensions(ElementBase):
+    namespace = NS
+    name = "extensions"
+    plugin_attrib = "extensions"
+
+
 def register_plugin():
+    register_stanza_plugin(Conference, Extensions)
     register_stanza_plugin(Item, Conference)
diff --git a/tests/test_stanza_xep_0402.py b/tests/test_stanza_xep_0402.py
new file mode 100644
index 00000000..68b59c1e
--- /dev/null
+++ b/tests/test_stanza_xep_0402.py
@@ -0,0 +1,50 @@
+import unittest
+
+from slixmpp.test import SlixTest
+from slixmpp.xmlstream import ElementBase
+from slixmpp.plugins.xep_0402 import stanza
+
+
+class Ext1(ElementBase):
+    name = "ext1"
+    namespace = "http://ext1"
+
+
+class Ext2(ElementBase):
+    name = "ext2"
+    namespace = "http://ext2"
+
+
+class TestPepBookmarks(SlixTest):
+    def setUp(self):
+        stanza.register_plugin()
+
+    def test_bookmarks_extensions(self):
+        extension1 = Ext1()
+        extension2 = Ext2()
+
+        bookmark = stanza.Conference()
+        bookmark["password"] = "pass"
+        bookmark["nick"] = "nick"
+        bookmark["autojoin"] = False
+        bookmark["extensions"].append(extension1)
+        bookmark["extensions"].append(extension2)
+        self.check(
+            bookmark,
+            """
+            <conference xmlns='urn:xmpp:bookmarks:1'
+                        autojoin='false'>
+              <nick>nick</nick>
+              <password>pass</password>
+              <extensions>
+                <ext1 xmlns="http://ext1" />
+                <ext2 xmlns="http://ext2" />
+              </extensions>
+            </conference>
+            """,
+            use_values=False
+        )
+
+
+
+suite = unittest.TestLoader().loadTestsFromTestCase(TestPepBookmarks)