diff --git a/facho/cli.py b/facho/cli.py
index fd8d0c7..4300277 100644
--- a/facho/cli.py
+++ b/facho/cli.py
@@ -29,6 +29,19 @@ logging.config.dictConfig({
     }
 })
 
+
+# MACHETE se corrige
+# lxml.etree.DocumentInvalid: Element '{http://www.w3.org/2000/09/xmldsig#}X509SerialNumber': '34255301462796514282327995225552892834' is not a valid value of the atomic type 'xs:integer'.
+import xmlsig, os.path
+path_schema = os.path.join(os.path.dirname(xmlsig.__file__), 'data', 'xmldsig-core-schema.xsd')
+with open(path_schema, 'r+') as f:
+    content = f.read().replace('<element name="X509SerialNumber" type="integer"/>',
+                               '<element name="X509SerialNumber" type="string"/>')
+    f.seek(0)
+    f.write(content)
+    warnings.warn("!!MACHETE fix xmlsig X509SerialNumber type")
+
+    
 @click.command()
 @click.option('--nit', required=True)
 @click.option('--nit-proveedor', required=True)