diff --git a/txupnp/scpd.py b/txupnp/scpd.py
index de59353..14c6f9f 100644
--- a/txupnp/scpd.py
+++ b/txupnp/scpd.py
@@ -36,7 +36,7 @@ def xml_arg(name, arg):
 
 def get_soap_body(service_name, method, param_names, **kwargs):
     args = "".join(xml_arg(n, kwargs.get(n)) for n in param_names)
-    return '\n%s\n<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><s:Body><u:%s xmlns:u="%s">%s</u:%s></s:Body></s:Envelope></xml>' % (XML_VERSION, method, service_name, args, method)
+    return '\n%s\n<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><s:Body><u:%s xmlns:u="%s">%s</u:%s></s:Body></s:Envelope>' % (XML_VERSION, method, service_name, args, method)
 
 
 class _SCPDCommand(object):
@@ -193,7 +193,7 @@ class SCPDCommandRunner(object):
         name, inputs, outputs = self._soap_function_info(action_info)
         command = _SCPDCommand(self._http_client, self._gateway.base_address, self._gateway.port,
                                self._gateway.base_address + self._gateway.get_service(service_type).controlURL.encode(),
-                               self._gateway.get_service(service_type).serviceId.encode(), name, inputs, outputs)
+                               self._gateway.get_service(service_type).serviceType.encode(), name, inputs, outputs)
         current = getattr(self, command.method)
         if hasattr(current, "_return_types"):
             command._process_result = _return_types(*current._return_types)(command._process_result)