diff --git a/tool/nixvirt.py b/tool/nixvirt.py
index 6c0c5b2..89419df 100644
--- a/tool/nixvirt.py
+++ b/tool/nixvirt.py
@@ -175,7 +175,7 @@ def _fixDefinitionETree(self,objid,specDefETree):
                 mac = lxml.etree.Element("mac")
                 mac.attrib["address"] = addr
                 specDefETree.append(mac)
-                return specDefETree        
+                return specDefETree
         return None
 
 # https://libvirt.org/html/libvirt-libvirt-storage.html
@@ -367,7 +367,7 @@ def define(self):
                 diff = xmldiff.main.diff_trees(oldDefETree,newDefETree)
                 if len(diff) > 0:
                     if self.oc.session.verbose:
-                        difftext = xmldiff.main.diff_trees(oldDefETree,newDefETree,formatter=xmldiff.formatting.DiffFormatter())
+                        difftext = xmldiff.main.diff_trees(oldDefETree,newDefETree,formatter=xmldiff.formatting.XMLFormatter())
                         self.vreport("changed:\n" + difftext)
                     self.subject._deactivate()
                 else: