diff --git a/synapse/rest/client/relations.py b/synapse/rest/client/relations.py
index ce97080013..205c556f64 100644
--- a/synapse/rest/client/relations.py
+++ b/synapse/rest/client/relations.py
@@ -56,15 +56,21 @@ class RelationPaginationServlet(RestServlet):
requester = await self.auth.get_user_by_req(request, allow_guest=True)
limit = parse_integer(request, "limit", default=5)
- if self._msc3715_enabled:
- direction = parse_string(
- request,
- "org.matrix.msc3715.dir",
- default="b",
- allowed_values=["f", "b"],
- )
- else:
- direction = "b"
+ # Fetch the direction parameter, if provided.
+ #
+ # TODO Use PaginationConfig.from_request when the unstable parameter is
+ # no longer needed.
+ direction = parse_string(request, "dir", allowed_values=["f", "b"])
+ if direction is None:
+ 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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