diff --git a/r2/r2/controllers/reddit_base.py b/r2/r2/controllers/reddit_base.py
index fd9e2afc4..3e8d7a171 100644
--- a/r2/r2/controllers/reddit_base.py
+++ b/r2/r2/controllers/reddit_base.py
@@ -391,8 +391,8 @@ def set_subreddit():
     routes_dict = request.environ["pylons.routes_dict"]
     if "multipath" in routes_dict and "username" in routes_dict:
         try:
-            path = '/user/%s/m/%s' % (routes_dict["username"],
-                                      routes_dict["multipath"])
+            path = '/user/%s/m/%s' % (routes_dict["username"].lower(),
+                                      routes_dict["multipath"].lower())
             c.site = LabeledMulti._byID(path)
         except tdb_cassandra.NotFound:
             abort(404)