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-rw-r--r--sphinx/websupport/storage/differ.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/websupport/storage/differ.py b/sphinx/websupport/storage/differ.py
index d52250718..8e430a137 100644
--- a/sphinx/websupport/storage/differ.py
+++ b/sphinx/websupport/storage/differ.py
@@ -58,7 +58,7 @@ class CombinedHtmlDiff(object):
if next is not None and next[0] == '?':
tag = 'ins' if prefix == '+' else 'del'
text = self._highlight_text(text, next, tag)
- css_class = 'prop_added' if prefix == '+' else 'prop_removed'
+ css_class = 'prop-added' if prefix == '+' else 'prop-removed'
return '<span class="%s">%s</span>\n' % (css_class, text.rstrip())