diff --git a/infinitime.go b/infinitime.go
index f761d20..9f25897 100644
--- a/infinitime.go
+++ b/infinitime.go
@@ -672,7 +672,7 @@ func (i *Device) initNotifEvent() error {
 
 // FS creates and returns a new filesystem from the device
 func (i *Device) FS() (*blefs.FS, error) {
-	if err := i.checkStatus(i.currentTimeChar); err != nil {
+	if err := i.checkStatus(i.fsTransferChar); err != nil {
 		return nil, err
 	}
 	return blefs.New(i.fsTransferChar)