diff --git a/clientapi/routing/routing.go b/clientapi/routing/routing.go
index e72880ec5..ec5ca899e 100644
--- a/clientapi/routing/routing.go
+++ b/clientapi/routing/routing.go
@@ -70,6 +70,7 @@ func Setup(
 
 	unstableFeatures := map[string]bool{
 		"org.matrix.e2e_cross_signing": true,
+		"org.matrix.msc2285.stable":    true,
 	}
 	for _, msc := range cfg.MSCs.MSCs {
 		unstableFeatures["org.matrix."+msc] = true