diff --git a/sleekxmpp/plugins/xep_0009/binding.py b/sleekxmpp/plugins/xep_0009/binding.py
index 30f02d36..ef34b580 100644
--- a/sleekxmpp/plugins/xep_0009/binding.py
+++ b/sleekxmpp/plugins/xep_0009/binding.py
@@ -63,7 +63,7 @@ def _py2xml(*args):
             double.text = str(x)
             val.append(double)
         elif type(x) is rpcbase64:
-            b64 = ET.Element("Base64")
+            b64 = ET.Element("base64")
             b64.text = x.encoded()
             val.append(b64)
         elif type(x) is rpctime:
@@ -110,7 +110,10 @@ def _xml2py(value):
         return value.find('{%s}string' % namespace).text
     if value.find('{%s}double' % namespace) is not None:
         return float(value.find('{%s}double' % namespace).text)
+    if value.find('{%s}base64') is not None:
+        return rpcbase64(value.find('base64' % namespace).text)
     if value.find('{%s}Base64') is not None:
+        # Older versions of XEP-0009 used Base64
         return rpcbase64(value.find('Base64' % namespace).text)
     if value.find('{%s}dateTime.iso8601') is not None:
         return rpctime(value.find('{%s}dateTime.iso8601'))