diff --git a/pytrustnfe/servicos/assinatura.py b/pytrustnfe/servicos/assinatura.py
index a42adab..6a0a0a6 100644
--- a/pytrustnfe/servicos/assinatura.py
+++ b/pytrustnfe/servicos/assinatura.py
@@ -35,12 +35,8 @@ def assinar(xml, cert, key, reference):
         if recursively_empty(elem):
             parent.remove(elem)
 
-    element = xml.find('{' + xml.nsmap[None] + '}NFe')
-    not_signed = etree.tostring(element)
-    not_signed = "<!DOCTYPE NFe [<!ATTLIST infNFe Id ID #IMPLIED>]>" + \
-        not_signed
-
-    signer = xmldsig(element, digest_algorithm=u'sha1')
+    # element = xml.find('{' + xml.nsmap[None] + '}NFe')
+    signer = xmldsig(xml, digest_algorithm=u'sha1')
     ns = {}
     ns[None] = signer.namespaces['ds']
     signer.namespaces = ns
diff --git a/pytrustnfe/servicos/nfe_autorizacao.py b/pytrustnfe/servicos/nfe_autorizacao.py
index dfc95b4..700a5c2 100644
--- a/pytrustnfe/servicos/nfe_autorizacao.py
+++ b/pytrustnfe/servicos/nfe_autorizacao.py
@@ -6,6 +6,8 @@ Created on 21/06/2015
 '''
 from lxml import etree
 from suds.sax.element import Element
+from suds.sax.text import Raw
+from suds.sax.parser import Parser
 from pytrustnfe.servicos.comunicacao import Comunicacao
 from pytrustnfe import utils
 from pytrustnfe.xml import render_xml
@@ -31,7 +33,11 @@ class NfeAutorizacao(Comunicacao):
         cabecalho.versaoDados = '3.10'
         client.set_options(soapheaders=cabecalho)
 
-        resposta = client.service.nfeAutorizacaoLote(xml_signed)
+        p = Parser()
+        import ipdb; ipdb.set_trace()
+        resposta = client.service.nfeAutorizacaoLote(
+            p.parse(string=xml_signed).root())
+
         print client.last_sent()
         print client.last_received()
 
diff --git a/pytrustnfe/xml/nfeEnv.xml b/pytrustnfe/xml/nfeEnv.xml
index 01e137f..e1a21e2 100644
--- a/pytrustnfe/xml/nfeEnv.xml
+++ b/pytrustnfe/xml/nfeEnv.xml
@@ -169,6 +169,7 @@
                 <infCpl>{{ NFe.infNFe.infAdic.infCpl }}</infCpl>
             </infAdic>
         </infNFe>
+        <Signature Id="placeholder"></Signature>
     </NFe>
     {% endfor %}
 </enviNFe>