diff --git a/clientapi/routing/state_test.go b/clientapi/routing/state_test.go
index cc4af9660..7825f9247 100644
--- a/clientapi/routing/state_test.go
+++ b/clientapi/routing/state_test.go
@@ -3,6 +3,7 @@ package routing
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"net/http"
 	"testing"
 
@@ -29,6 +30,15 @@ type testRoomserverAPI struct {
 	senderMapping map[string]string
 }
 
+func (s testRoomserverAPI) QueryRoomVersionForRoom(ctx context.Context, roomID string) (gomatrixserverlib.RoomVersion, error) {
+	if roomID == s.roomIDStr {
+		return s.roomVersion, nil
+	} else {
+		s.t.Logf("room version queried for %s", roomID)
+		return "", fmt.Errorf("unknown room")
+	}
+}
+
 func (s testRoomserverAPI) QueryLatestEventsAndState(
 	ctx context.Context,
 	req *rsapi.QueryLatestEventsAndStateRequest,