diff --git a/synapse/rest/client/relations.py b/synapse/rest/client/relations.py
index 3cae6d2b55..ce97080013 100644
--- a/synapse/rest/client/relations.py
+++ b/synapse/rest/client/relations.py
@@ -43,6 +43,7 @@ class RelationPaginationServlet(RestServlet):
self.auth = hs.get_auth()
self.store = hs.get_datastores().main
self._relations_handler = hs.get_relations_handler()
+ self._msc3715_enabled = hs.config.experimental.msc3715_enabled
async def on_GET(
self,
@@ -55,9 +56,15 @@ class RelationPaginationServlet(RestServlet):
requester = await self.auth.get_user_by_req(request, allow_guest=True)
limit = parse_integer(request, "limit", default=5)
- direction = parse_string(
- request, "org.matrix.msc3715.dir", default="b", allowed_values=["f", "b"]
- )
+ if self._msc3715_enabled:
+ direction = parse_string(
+ request,
+ "org.matrix.msc3715.dir",
+ default="b",
+ allowed_values=["f", "b"],
+ )
+ else:
+ direction = "b"
from_token_str = parse_string(request, "from")
to_token_str = parse_string(request, "to")
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