diff --git a/html5lib/sanitizer.py b/html5lib/sanitizer.py
index 469d9b40..5ea20e96 100644
--- a/html5lib/sanitizer.py
+++ b/html5lib/sanitizer.py
@@ -182,9 +182,7 @@ def allowed_token(self, token, token_type):
attrs = dict([(name, val) for name, val in
token["data"][::-1]
if name in self.allowed_attributes])
- for attr in self.attr_val_is_uri:
- if attr not in attrs:
- continue
+ for attr in set(attrs.keys()).intersection(set(self.attr_val_is_uri)):
val_unescaped = re.sub("[`\000-\040\177-\240\s]+", '',
unescape(attrs[attr])).lower()
# remove replacement characters from unescaped characters
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