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-rw-r--r--bs4/builder/_lxml.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/bs4/builder/_lxml.py b/bs4/builder/_lxml.py
index 6491322..c78fdff 100644
--- a/bs4/builder/_lxml.py
+++ b/bs4/builder/_lxml.py
@@ -88,6 +88,9 @@ class LXMLTreeBuilderForXML(TreeBuilder):
self.nsmaps = None
def start(self, name, attrs, nsmap={}):
+ # Make sure attrs is a mutable dict--lxml may send an immutable dictproxy.
+ attrs = dict(attrs)
+
nsprefix = None
# Invert each namespace map as it comes in.
if len(nsmap) == 0 and self.nsmaps != None: