1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/rest/admin/rooms.py b/synapse/rest/admin/rooms.py
index f289ffe3d0..f0cddd2d2c 100644
--- a/synapse/rest/admin/rooms.py
+++ b/synapse/rest/admin/rooms.py
@@ -649,7 +649,7 @@ class RoomEventContextServlet(RestServlet):
         limit = parse_integer(request, "limit", default=10)
 
         # picking the API shape for symmetry with /messages
-        filter_str = parse_string(request, b"filter", encoding="utf-8")
+        filter_str = parse_string(request, "filter", encoding="utf-8")
         if filter_str:
             filter_json = urlparse.unquote(filter_str)
             event_filter = Filter(