diff --git a/federationapi/routing/invite.go b/federationapi/routing/invite.go
index 81dbf26a7..59f8dd1be 100644
--- a/federationapi/routing/invite.go
+++ b/federationapi/routing/invite.go
@@ -188,6 +188,9 @@ func InviteV1(
 		StateQuerier:      rsAPI.StateQuerier(),
 		InviteEvent:       event,
 		StrippedState:     strippedState,
+		UserIDQuerier: func(roomAliasOrID, senderID string) (*spec.UserID, error) {
+			return rsAPI.QueryUserIDForSender(httpReq.Context(), roomAliasOrID, senderID)
+		},
 	}
 	event, jsonErr := handleInvite(httpReq.Context(), input, rsAPI)
 	if jsonErr != nil {