--- ElementTree.py.dist	2010-10-26 21:38:33.563988003 +0200
+++ ElementTree.py	2010-10-26 21:38:51.287988002 +0200
@@ -871,8 +871,9 @@
         iterate = elem.getiterator # cET compatibility
     for elem in iterate():
         tag = elem.tag
-        if isinstance(tag, QName) and tag.text not in qnames:
-            add_qname(tag.text)
+        if isinstance(tag, QName):
+            if tag.text not in qnames:
+                add_qname(tag.text)
         elif isinstance(tag, basestring):
             if tag not in qnames:
                 add_qname(tag)