diff --git a/r2/r2/lib/pages/wiki.py b/r2/r2/lib/pages/wiki.py
index 53c9fa2cb..43673af55 100644
--- a/r2/r2/lib/pages/wiki.py
+++ b/r2/r2/lib/pages/wiki.py
@@ -132,7 +132,7 @@ class WikiBasePage(Reddit):
             context["title"] = _("%(page)s - %(site)s") % {
                 "site": c.site.name,
                 "page": page}
-            page_classes = ['wiki-page-%s' % page]
+            page_classes = ['wiki-page-%s' % page.replace('/', '-')]
 
         Reddit.__init__(self, extra_js_config={'wiki_page': page}, 
                         show_wiki_actions=True, page_classes=page_classes,