diff --git a/federationapi/routing/send.go b/federationapi/routing/send.go
index 104e2ad5e..dced1fb92 100644
--- a/federationapi/routing/send.go
+++ b/federationapi/routing/send.go
@@ -1020,8 +1020,8 @@ func (t *txnReq) lookupEvent(ctx context.Context, roomVersion gomatrixserverlib.
 		break
 	}
 	if !found {
-		util.GetLogger(ctx).WithField("event_id", missingEventID).Warnf("Failed to get missing /event for event ID from %d server(s)", len(t.servers))
-		return nil, fmt.Errorf("wasn't able to find event via %d server(s)", len(t.servers))
+		util.GetLogger(ctx).WithField("event_id", missingEventID).Warnf("Failed to get missing /event for event ID from %d server(s)", numServers)
+		return nil, fmt.Errorf("wasn't able to find event via %d server(s)", numServers)
 	}
 	if err := gomatrixserverlib.VerifyAllEventSignatures(ctx, []gomatrixserverlib.Event{event}, t.keys); err != nil {
 		util.GetLogger(ctx).WithError(err).Warnf("Transaction: Couldn't validate signature of event %q", event.EventID())